Q: What is the sum of all factors of the number 18,105 excluding 18,105?

 A: 12,999

Why is 12,999 the sum of all factors of 18,105, excluding 18,105?

The factors of the number 18,105 are: 1, 3, 5, 15, 17, 51, 71, 85, 213, 255, 355, 1065, 1207, 3621, 6035, 18105.

If you add them up, you will get the total of 18,117. Now subtract 18,105 to get 12,999


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