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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 280?

 Nov 27, 2021
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1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140      add these together.....

 Nov 27, 2021

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