Q: What is the sum of all factors of the number 21,284 excluding 21,284?

 A: 18,280

Why is 18,280 the sum of all factors of 21,284, excluding 21,284?

The factors of the number 21,284 are: 1, 2, 4, 17, 34, 68, 313, 626, 1252, 5321, 10642, 21284.

If you add them up, you will get the total of 21,302. Now subtract 21,284 to get 18,280


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