1 + 2 + 4 + 5 + 7 + 10 + 14 + 20 + 28 + 35 + 49 + 70 + 98 + 140 + 196 + 245 + 490 + 980 = 2,394
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980
154 is the sum of the proper factors of 256.
Add them up. The factors of 9 are 1, 3 and 9. The sum of the factors is 13.
The odd factors of 70 are: 1, 5, 7, and 35. The sum of these factors is 48.
980