Q: What is the sum of all factors of the number 19,990 excluding 19,990?

 A: 16,010

Why is 16,010 the sum of all factors of 19,990, excluding 19,990?

The factors of the number 19,990 are: 1, 2, 5, 10, 1999, 3998, 9995, 19990.

If you add them up, you will get the total of 20,006. Now subtract 19,990 to get 16,010


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