18909980

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{20117}}^1$

素因数の和:20173

約数の個数: 24

約数和(自身を含む): 40557888

約数和(自身を除く): 21647908

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 188, 235, 470, 940, 20117, 40234, 80468, 100585, 201170, 402340, 945499, 1890998, 3781996, 4727495, 9454990, 18909980]

約数ペア:

[(1, 18909980), (2, 9454990), (4, 4727495), (5, 3781996), (10, 1890998), (20, 945499), (47, 402340), (94, 201170), (188, 100585), (235, 80468), (470, 40234), (940, 20117)]