Q: What is the sum of all factors of the number 520 excluding 520?

 A: 740

Why is 740 the sum of all factors of 520, excluding 520?

The factors of the number 520 are: 1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520.

If you add them up, you will get the total of 1,260. Now subtract 520 to get 740


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