Q: What is the sum of all factors of the number 81,980 excluding 81,980?

A: 90,220

Why is 90,220 the sum of all factors of 81,980, excluding 81,980?

The factors of the number 81,980 are: 1, 2, 4, 5, 10, 20, 4099, 8198, 16396, 20495, 40990, 81980.

If you add them up, you will get the total of 82,070. Now subtract 81,980 to get 90,220

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