Q: What is the sum of all factors of the number 399,903 excluding 399,903?

 A: 218,337

Why is 218,337 the sum of all factors of 399,903, excluding 399,903?

The factors of the number 399,903 are: 1, 3, 7, 21, 137, 139, 411, 417, 959, 973, 2877, 2919, 19043, 57129, 133301, 399903.

If you add them up, you will get the total of 400,121. Now subtract 399,903 to get 218,337


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