Q: What is the sum of all factors of the number 640,005 excluding 640,005?

 A: 384,027

Why is 384,027 the sum of all factors of 640,005, excluding 640,005?

The factors of the number 640,005 are: 1, 3, 5, 15, 42667, 128001, 213335, 640005.

If you add them up, you will get the total of 640,389. Now subtract 640,005 to get 384,027


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