Q: What is the sum of all factors of the number 9,999 excluding 9,999?

 A: 5,913

Why is 5,913 the sum of all factors of 9,999, excluding 9,999?

The factors of the number 9,999 are: 1, 3, 9, 11, 33, 99, 101, 303, 909, 1111, 3333, 9999.

If you add them up, you will get the total of 10,004. Now subtract 9,999 to get 5,913


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