21581680

素因数分解:

$2^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{2671}}^1$

素因数の和:2785

約数の個数: 40

約数和(自身を含む): 50693184

約数和(自身を除く): 29111504

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 101, 202, 404, 505, 808, 1010, 1616, 2020, 2671, 4040, 5342, 8080, 10684, 13355, 21368, 26710, 42736, 53420, 106840, 213680, 269771, 539542, 1079084, 1348855, 2158168, 2697710, 4316336, 5395420, 10790840, 21581680]

約数ペア:

[(1, 21581680), (2, 10790840), (4, 5395420), (5, 4316336), (8, 2697710), (10, 2158168), (16, 1348855), (20, 1079084), (40, 539542), (80, 269771), (101, 213680), (202, 106840), (404, 53420), (505, 42736), (808, 26710), (1010, 21368), (1616, 13355), (2020, 10684), (2671, 8080), (4040, 5342)]