Q: What is the sum of all factors of the number 8,720 excluding 8,720?

 A: 11,740

Why is 11,740 the sum of all factors of 8,720, excluding 8,720?

The factors of the number 8,720 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 4360, 8720.

If you add them up, you will get the total of 8,731. Now subtract 8,720 to get 11,740


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