A divisor of a number is a proper divisor if it is not equal to the number. What is the sum of the proper divisors of 432?
(1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27, 36, 48, 54, 72, 108, 144, 216, 432) >>Total = 20 Divisors
Add up all the divisors EXCEPT 432
