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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?

 May 22, 2021
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Simple calculations get 640 (Just list out all of the factors and add! )

 May 22, 2021

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