21718120

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3331}}^1$

素因数の和:3505

約数の個数: 32

約数和(自身を含む): 49180320

約数和(自身を除く): 27462200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3260, 3331, 6520, 6662, 13324, 16655, 26648, 33310, 66620, 133240, 542953, 1085906, 2171812, 2714765, 4343624, 5429530, 10859060, 21718120]

約数ペア:

[(1, 21718120), (2, 10859060), (4, 5429530), (5, 4343624), (8, 2714765), (10, 2171812), (20, 1085906), (40, 542953), (163, 133240), (326, 66620), (652, 33310), (815, 26648), (1304, 16655), (1630, 13324), (3260, 6662), (3331, 6520)]