Q: What is the sum of all factors of the number 440 excluding 440?

 A: 640

Why is 640 the sum of all factors of 440, excluding 440?

The factors of the number 440 are: 1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440.

If you add them up, you will get the total of 1,080. Now subtract 440 to get 640


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