19800220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{90001}}^1$

素因数の和:90021

約数の個数: 24

約数和(自身を含む): 45361008

約数和(自身を除く): 25560788

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 90001, 180002, 360004, 450005, 900010, 990011, 1800020, 1980022, 3960044, 4950055, 9900110, 19800220]

約数ペア:

[(1, 19800220), (2, 9900110), (4, 4950055), (5, 3960044), (10, 1980022), (11, 1800020), (20, 990011), (22, 900010), (44, 450005), (55, 360004), (110, 180002), (220, 90001)]