The proper divisors of 12 are 1, 2, 3, 4 and 6. A proper divisor of an integer N is a positive divisor of N that is less than N. What is the sum of the proper divisors of the sum of the proper divisors of 284?
(1, 2, 4, 71, 142) >>Total = 5 proper divisors of 284. Sum[1+2+4+71+142]=220 sum of proper divisors of 284 Sum[2+2+0] = 4 sum of the sum of proper divisors of 284.
+174 
