Find sum of even factors of a number
Basic Accuracy: 6.44% Submissions: 31 Points: 1

Given a number N, find the even factor sum of the number N.
 

Example 1:

Input: 
N = 30 
Output: 
48 
Explanation:
Even dividers sum 2 + 6 + 10 + 30 = 48

Example 2:

Input: 
N = 18 
Output: 
26 
Explanation:
Even dividers sum 2 + 6 + 18 = 26


Your Task:
You don't need to read input or print anything. Your task is to complete the function evenFactors() which takes an integer N as input parameters and returns an integer, number of even factors of N.

 

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

 

Constraints:
1 <= N <= 109

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