Q: What is the sum of all factors of the number 680 excluding 680?

 A: 940

Why is 940 the sum of all factors of 680, excluding 680?

The factors of the number 680 are: 1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680.

If you add them up, you will get the total of 1,620. Now subtract 680 to get 940


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