Q: What is the sum of all factors of the number 420,421,407 excluding 420,421,407?

 A: 257,906,145

Why is 257,906,145 the sum of all factors of 420,421,407, excluding 420,421,407?

The factors of the number 420,421,407 are: 1, 3, 7, 17, 21, 51, 119, 357, 1177651, 3532953, 8243557, 20020067, 24730671, 60060201, 140140469, 420421407.

If you add them up, you will get the total of 420,421,664. Now subtract 420,421,407 to get 257,906,145


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