C :

#include<stdio.h>
#include<math.h>
int he(int n)
{
	int s, i;
	for(s = 1, i = 2; i <= n / 2; i++)
	{
		if(n % i == 0)
			s += i;
	}
	return s;
}
int main()
{
	int t, i, j;
	scanf("%d", &t);
	for(i = 2; i <= t; i++)
	{
		if(i == he(i))
		{
			printf("%d its factors are ", i);
			for(j = 1; j <= i / 2; j++)
				if(i % j == 0)
					printf("%d ", j);
				puts("");
		}
	}
}

C++ :

#include<stdio.h>
int main()
{
    int a,b,c,d,sum,n;
    scanf("%d",&n);
    for(b=2; b<=n; b++)
    {
        sum=0;
        for(a=1; a<b; a++)
        {
            if(b%a==0)
                sum=sum+a;
        }
        if(sum==b)
        {
            printf("%d its factors are ",b);
            for(a=1; a<b; a++)
                if(b%a==0)
                    printf("%d ",a);
                    printf("\n");
        }
    }
}