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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 <= 10^{9}

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Find sum of even factors of a number

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