Factors Sum
Basic Accuracy: 19.99% Submissions: 55 Points: 1

Given a number N, find the sum of all its factors.

Example 1:

Input: N = 30
Output: 72
Explanation: Factors sum 1 + 2 + 3 + 5
+ 6 + 10 + 15 + 30 = 72

Example 2:

Input: N = 15
Output: 24
Explanation: Factors sum 1 + 3 + 5
+ 15 = 24

You don't need to read input or print anything. Your task is to complete the function factorSum() which takes N as input and returns the sum.

Expected Time Complexity: O(sqrt N)
Expected Auxiliary Space: O(1)

Constraints:
1 ≤ ≤ 109