0507. Perfect Number
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https://leetcode.com/problems/perfect-number
A is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. A divisor of an integer x is an integer that can divide x evenly.
Given an integer n, return true if n is a perfect number, otherwise return false.
Example 1:
Example 2:
Example 3:
Example 4:
Example 5:
Constraints:
1 <= num <= 108