639492080

素因数分解:

$2^4\times 5^1\times {\mathrm{7993651}}^1$

素因数の和:7993664

約数の個数: 20

約数和(自身を含む): 1486819272

約数和(自身を除く): 847327192

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7993651, 15987302, 31974604, 39968255, 63949208, 79936510, 127898416, 159873020, 319746040, 639492080]

約数ペア:

[(1, 639492080), (2, 319746040), (4, 159873020), (5, 127898416), (8, 79936510), (10, 63949208), (16, 39968255), (20, 31974604), (40, 15987302), (80, 7993651)]