Q: What is the sum of all factors of the number 405,890 excluding 405,890?
A: 345,142
The factors of the number 405,890 are: 1, 2, 5, 10, 37, 74, 185, 370, 1097, 2194, 5485, 10970, 40589, 81178, 202945, 405890.
If you add them up, you will get the total of 406,235. Now subtract 405,890 to get 345,142