C :

#include <stdio.h>
 
int main()
{
    int num;
    int sum=0;//因子之和
    scanf("%d",&num);
    int i;
    for(i=1; i<=num/2; i++)
    {
        if(num%i==0)
            sum+=i;
    }
    if(sum==num)
        printf("yes\n");
    else
        printf("no\n");
    return 0;
}

C++ :

#include<iostream>
#include<cmath>
using namespace std;
long long a,gs=0;
int main()
{
	cin>>a;
	for(int i=1; i<a; i++)
	{
		if(a%i==0) gs+=i;
	}
	if(gs==a) cout<<"yes";
	else cout<<"no";
    return 0;
}

Java :

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
//        int b = scanner.nextInt();
        int s = 0;
        for(int i = 1;i < a;i++){
            if(a % i == 0)s = s + i;
        }
        if(s == a) System.out.println("yes");
        else System.out.println("no");


    }public static void paiXu(int[] a,int length){
        int temp;
        for(int i = 0;i < length - 1;i++){
            for(int k = 0;k < length - i - 1;k++){
                if(a[k] > a[k + 1]){
                    temp = a[k];
                    a[k] = a[k + 1];
                    a[k + 1] = temp;
                }
            }
        }
    } public static void paiXud(int[] a){
        int temp;
        for(int i = 0;i < a.length - 1;i++){
            for(int k = 0;k < a.length - i - 1;k++){
                if(a[k] < a[k + 1]){
                    temp = a[k];
                    a[k] = a[k + 1];
                    a[k + 1] = temp;
                }
            }
        }
    } public static void paiXux(int[] a){
        int temp;
        for(int i = 0;i < a.length - 1;i++){
            for(int k = 0;k < a.length - i - 1;k++){
                if(a[k] > a[k + 1]){
                    temp = a[k];
                    a[k] = a[k + 1];
                    a[k + 1] = temp;
                }
            }
        }
    }

    public static int MAX(int[] a){
        int max = a[0];
        for (int i = 0; i < a.length; i++) {
            if(max < a[i]){
                max = a[i];
            }
        }
        return max;
    }

    public static int MIN(int[] a){
        int min = a[0];
        for (int i = 0; i < a.length; i++) {
            if(min > a[i]){
               min = a[i];
            }
        }
        return min;
    }
    public static int sum(int a){
        int x,s = 0;
        while(a != 0){
            x = a % 10;
            s = s + x;
            a /= 10;
        }
        return s;
    }
    public static boolean isPrime(int a){
        if(a <= 1)return false;
        else
        for(int i = 2;i <= Math.sqrt(a);i++){
            if(a % i == 0)return false;
        }return true;
    }

    public static long qiuYu(long i){
        long a;
        a = i % 10;
        return a;
    }
    public static int daoXu(int x){
        int s = 0,m;
        while(x != 0){
            m = x % 10;
            s = s * 10 + x;
            x /= 10;
        }
        return s;
    }

    public static int jiaWei(int x){
        int s = 0,m;
        while(x != 0){
            m = x % 10;
            s = s + m;
            x /= 10;
        }
        return s;
    }

}

Python :

n=int(input())
s=0
for i in range(1,n//2+1):
    if(n%i==0):
        s=s+i
if(s==n):
    print("yes")
else:
    print("no")