Q: What is the sum of all factors of the number 25,438 excluding 25,438?

 A: 20,642

Why is 20,642 the sum of all factors of 25,438, excluding 25,438?

The factors of the number 25,438 are: 1, 2, 7, 14, 23, 46, 79, 158, 161, 322, 553, 1106, 1817, 3634, 12719, 25438.

If you add them up, you will get the total of 25,458. Now subtract 25,438 to get 20,642


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