Q: What is the sum of all factors of the number 21,005,107 excluding 21,005,107?

 A: 13,149

Why is 13,149 the sum of all factors of 21,005,107, excluding 21,005,107?

The factors of the number 21,005,107 are: 1, 1861, 11287, 21005107.

If you add them up, you will get the total of 21,005,120. Now subtract 21,005,107 to get 13,149


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