18900220

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{21977}}^1$

素因数の和:22029

約数の個数: 24

約数和(自身を含む): 40615344

約数和(自身を除く): 21715124

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 21977, 43954, 87908, 109885, 219770, 439540, 945011, 1890022, 3780044, 4725055, 9450110, 18900220]

約数ペア:

[(1, 18900220), (2, 9450110), (4, 4725055), (5, 3780044), (10, 1890022), (20, 945011), (43, 439540), (86, 219770), (172, 109885), (215, 87908), (430, 43954), (860, 21977)]