Q: What is the sum of all factors of the number 19,809 excluding 19,809?

A: 10,143

Why is 10,143 the sum of all factors of 19,809, excluding 19,809?

The factors of the number 19,809 are: 1, 3, 9, 31, 71, 93, 213, 279, 639, 2201, 6603, 19809.

If you add them up, you will get the total of 19,819. Now subtract 19,809 to get 10,143

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