Q: What is the sum of all factors of the number 1,720 excluding 1,720?

 A: 2,240

Why is 2,240 the sum of all factors of 1,720, excluding 1,720?

The factors of the number 1,720 are: 1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720.

If you add them up, you will get the total of 1,722. Now subtract 1,720 to get 2,240


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