Q: What is the sum of all factors of the number 521,307,213 excluding 521,307,213?

 A: 307,604,403

Why is 307,604,403 the sum of all factors of 521,307,213, excluding 521,307,213?

The factors of the number 521,307,213 are: 1, 3, 7, 21, 23, 69, 161, 483, 1079311, 3237933, 7555177, 22665531, 24824153, 74472459, 173769071, 521307213.

If you add them up, you will get the total of 521,307,520. Now subtract 521,307,213 to get 307,604,403


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