Q: What is the sum of all factors of the number 11,980 excluding 11,980?

 A: 13,220

Why is 13,220 the sum of all factors of 11,980, excluding 11,980?

The factors of the number 11,980 are: 1, 2, 4, 5, 10, 20, 599, 1198, 2396, 2995, 5990, 11980.

If you add them up, you will get the total of 11,993. Now subtract 11,980 to get 13,220


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