Write a program in c++ to input a number print the sum of all the odd factors.

#include <bits/stdc++.h>

using namespace std;

//calculate sum of odd factors

int sum(int n) {    

int res = 1;  

 while (n % 2 == 0)  

 n = n/ 2;    

for (int i = 3; i <= sqrt(n); i++)

{      

int count = 0, total = 1 ;  

    int temp = 1;    

  while (n % i == 0) {  

       count++;      

   n = n / i;        

 temp *= i;        

 total += temp;    

  }      

res = res*total;  

 }  

 if (n >= 2)

   res *= (1 + n);  

 return res;

}

int main()

{

   int n = 20;  

 cout<<"sum of odd factors is : ";  

 cout <<sum(n);    

return 0;

}