Find minimum sum of factors of number

Given a number, find minimum sum of its factors.

Examples:

Input : 12
Output : 7
Explanation: 
Following are different ways to factorize 12 and
sum of factors in different ways.
12 = 12 * 1 = 12 + 1 = 13
12 = 2 * 6 = 2 + 6 = 8
12 = 3 * 4 = 3 + 4 = 7
12 = 2 * 2 * 3 = 2 + 2 + 3 = 7
Therefore minimum sum is 7

Input : 105
Output : 15

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

To minimize sum, we must factorize factors as long as possible. With this process, we prime factors. So to find minimum sum of product of number, we find sum of prime factors of product.

C++

// CPP program to find minimum 
// sum of product of number 
#include <bits/stdc++.h> 
using namespace std; 
  
// To find minimum sum of 
// product of number 
int findMinSum(int num) 
{ 
    int sum = 0; 
  
    // Find factors of number 
    // and add to the sum 
    for (int i = 2; i * i <= num; i++) { 
        while (num % i == 0) { 
            sum += i; 
            num /= i; 
        } 
    } 
    sum += num; 
  
    // Return sum of numbers 
    // having minimum product 
    return sum; 
} 
  
// Driver program to test above function 
int main() 
{ 
    int num = 12; 
  
    cout << findMinSum(num); 
  
    return 0; 
} 

Java

// Java program to find minimum 
// sum of product of number 
  
public class Main { 
  
    // To find minimum sum of 
    // product of number 
    static int findMinSum(int num) 
    { 
        int sum = 0; 
  
        // Find factors of number 
        // and add to the sum 
        for (int i = 2; i * i <= num; i++) { 
            while (num % i == 0) { 
                sum += i; 
                num /= i; 
            } 
        } 
        sum += num; 
  
        // Return sum of numbers 
        // having minimum product 
        return sum; 
    } 
  
    // Driver program to test above function 
    public static void main(String[] args) 
    { 
        int num = 12; 
        System.out.println(findMinSum(num)); 
    } 
} 

Python

# Python program to find minimum 
# sum of product of number 
   
# To find minimum sum of 
# product of number 
def findMinSum(num): 
    sum = 0
      
    # Find factors of number 
    # and add to the sum 
    i = 2
    while(i * i <= num): 
        while(num % i == 0): 
            sum += i 
            num /= i 
        i += 1
    sum += num 
      
    # Return sum of numbers 
    # having minimum product 
    return sum
  
# Driver Code 
num = 12
print findMinSum(num) 
  
# This code is contributed by Sachin Bisht 

C#

// C# program to find minimum 
// sum of product of number 
using System;  
  
public class GFG { 
  
    // To find minimum sum of 
    // product of number 
    static int findMinSum(int num) 
    { 
        int sum = 0; 
  
        // Find factors of number 
        // and add to the sum 
        for (int i = 2; i * i <= num; i++) { 
            while (num % i == 0) { 
                sum += i; 
                num /= i; 
            } 
        } 
        sum += num; 
  
        // Return sum of numbers 
        // having minimum product 
        return sum; 
    } 
  
    // Driver Code 
    public static void Main() 
    { 
        int num = 12; 
        Console.Write(findMinSum(num)); 
    } 
      
} 
  
// This Code is contributed by Nitin Mittal. 

PHP

<?php 
// PHP program to find minimum 
// sum of product of number 
  
// To find minimum sum of 
// product of number 
function findMinSum($num) 
{ 
    $sum = 0; 
  
    // Find factors of number 
    // and add to the sum 
    for ($i = 2; $i * $i <= $num; $i++)  
    { 
        while ($num % $i == 0)  
        { 
            $sum += $i; 
            $num /= $i; 
        } 
    } 
    $sum += $num; 
  
    // Return sum of numbers 
    // having minimum product 
    return $sum; 
} 
  
// Driver Code 
$num = 12; 
  
echo(findMinSum($num)); 
  
// This code is contributed by Ajit. 
?> 

Output:

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My Personal Notes

Improved By : nitin mittal, jit_t

Practice Tags :

number-theory

Mathematical