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Given a number N.Find the minimum sum of its factors.

**Example 1:**

**Input:**
N=10
**Output:**
7
**Explanation:**
There are two ways to factories N, which are
10=1*10(sum=10+1=11)
10=2*5(sum=2+5=7)
Thus, the answer is 7.

**Example 2:**

**Input:**
N=12
**Output:**
7
**Explanation:**
There are ways to factorise N, which are
12=12*1(sum=12+1=13)
12=3*4(sum=3+4=7)
12=6*2(sum=6+2=8)
12=2*3*2(sum=2+3+2=7).

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **sumOfFactors()** which takes a number N as an input parameter and returns the minimum sum of its factors.

**Expected Time Complexity:**O(N^{1/2})

**Expected Auxillary Space:**O(1)

**Constraints:**

1<=N<=10^{5}

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Minimum sum of factors

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