Q: What is the sum of all factors of the number 3,980 excluding 3,980?

A: 4,420

Why is 4,420 the sum of all factors of 3,980, excluding 3,980?

The factors of the number 3,980 are: 1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990, 3980.

If you add them up, you will get the total of 3,984. Now subtract 3,980 to get 4,420

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