#23 Non-abundant sums - Project Euler. projecteuler.net . Accessed Feb 19, 2023. Problem Statement A perfect number is a number for which the sum of its proper divisors is exactly equal to the number. For example, the sum of the proper divisors of \(28\) would be \(1 + 2 + 4 + 7 + 14 = 28\), which means that \(28\) is a perfect number....