Q: What is the sum of all factors of the number 21,396 excluding 21,396?

 A: 28,556

Why is 28,556 the sum of all factors of 21,396, excluding 21,396?

The factors of the number 21,396 are: 1, 2, 3, 4, 6, 12, 1783, 3566, 5349, 7132, 10698, 21396.

If you add them up, you will get the total of 21,424. Now subtract 21,396 to get 28,556


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