18420340

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{21419}}^1$

素因数の和:21471

約数の個数: 24

約数和(自身を含む): 39584160

約数和(自身を除く): 21163820

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 21419, 42838, 85676, 107095, 214190, 428380, 921017, 1842034, 3684068, 4605085, 9210170, 18420340]

約数ペア:

[(1, 18420340), (2, 9210170), (4, 4605085), (5, 3684068), (10, 1842034), (20, 921017), (43, 428380), (86, 214190), (172, 107095), (215, 85676), (430, 42838), (860, 21419)]