Q: What is the sum of all factors of the number 640,403 excluding 640,403?

 A: 4,237

Why is 4,237 the sum of all factors of 640,403, excluding 640,403?

The factors of the number 640,403 are: 1, 157, 4079, 640403.

If you add them up, you will get the total of 640,407. Now subtract 640,403 to get 4,237


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