Largest sum of divisors

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n,i,j, sum, max = -99999, keepNumber;
    scanf("%d", &n);
    for(i = 1; i <n; i++){
        sum = 0;
        for(j=2; j < i; j++){
            if(i % j == 0){
                sum+=j;
            }

        }

        if(sum>max){
            max = sum;
            keepNumber = i;
        }
    }
    printf("%d", keepNumber);
    return 0;
}