C :

#include<stdio.h>
int main()
{
	int n,i,s=0;
	scanf("%d",&n);
	for(i=1;i<n;i++)
	{
		if(n%i==0)
		{
			s=s+i;
		}
	}
	if(s==n)
	{
		printf("%d is cloze.",n);
	}
	else
	{
		printf("%d is not cloze.",n);
	}
	return 0;
}

C++ :

#include<stdio.h>
int main()
{
    int a=0,b,i,n;
    scanf("%d",&n);
    for(i=1;i<n;i++)
    {
        if(n%i==0)
        a=a+i;
    }
    if(a==n)
        printf("%d is cloze.",n);
    else
        printf("%d is not cloze.",n);
}

Java :

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int sum = 0;
        for (int i = 1 ; i < n ; i++){
            if (n%i == 0){
                sum += i;
            }
        }
        if (n == sum){
            System.out.println(n + " is cloze.");
        }else{
            System.out.println(n + " is not cloze.");
        }
    }
}

Python :

# coding=utf-8
#!/usr/bin/python2
import sys
import re
import math

n=int(input())

for i in range(1,n+1):
    num =0
    for j in range(1,i):
        if i%j==0:
            num=num + j
            
           
        
if n==num:
    print str(i)+' is cloze.'
else:
    print str(i)+' is not cloze.'
            
        

C# :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {

            int n = Convert.ToInt32(Console.ReadLine());
            int sum = 0;
            
            for (int i = 1; i < n; i++)
            {
                if (n % i == 0)
                {
                    sum = sum + i;
                }
            }
            if (sum == n) Console.WriteLine("{0} is cloze.", n);
            else Console.WriteLine("{0} is not cloze.", n);
            Console.ReadKey();

        }
    }
}