Q: What is the sum of all factors of the number 20,721,905 excluding 20,721,905?

 A: 4,170,679

Why is 4,170,679 the sum of all factors of 20,721,905, excluding 20,721,905?

The factors of the number 20,721,905 are: 1, 5, 1381, 3001, 6905, 15005, 4144381, 20721905.

If you add them up, you will get the total of 20,721,909. Now subtract 20,721,905 to get 4,170,679


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