Q: What is the sum of all factors of the number 21,903 excluding 21,903?

 A: 12,297

Why is 12,297 the sum of all factors of 21,903, excluding 21,903?

The factors of the number 21,903 are: 1, 3, 7, 21, 49, 147, 149, 447, 1043, 3129, 7301, 21903.

If you add them up, you will get the total of 21,915. Now subtract 21,903 to get 12,297


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