Q: What is the sum of all factors of the number 280 excluding 280?

 A: 440

Why is 440 the sum of all factors of 280, excluding 280?

The factors of the number 280 are: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280.

If you add them up, you will get the total of 720. Now subtract 280 to get 440


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