Q: What is the sum of all factors of the number 10,209 excluding 10,209?

 A: 3,903

Why is 3,903 the sum of all factors of 10,209, excluding 10,209?

The factors of the number 10,209 are: 1, 3, 41, 83, 123, 249, 3403, 10209.

If you add them up, you will get the total of 10,212. Now subtract 10,209 to get 3,903


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