18721870

素因数分解:

$2^1\times 5^1\times {\mathrm{421}}^1\times {\mathrm{4447}}^1$

素因数の和:4875

約数の個数: 16

約数和(自身を含む): 33787008

約数和(自身を除く): 15065138

約数列:

[1, 2, 5, 10, 421, 842, 2105, 4210, 4447, 8894, 22235, 44470, 1872187, 3744374, 9360935, 18721870]

約数ペア:

[(1, 18721870), (2, 9360935), (5, 3744374), (10, 1872187), (421, 44470), (842, 22235), (2105, 8894), (4210, 4447)]