398718940

素因数分解:

$2^2\times 5^1\times {\mathrm{991}}^1\times {\mathrm{20117}}^1$

素因数の和:21117

約数の個数: 24

約数和(自身を含む): 838196352

約数和(自身を除く): 439477412

約数列:

[1, 2, 4, 5, 10, 20, 991, 1982, 3964, 4955, 9910, 19820, 20117, 40234, 80468, 100585, 201170, 402340, 19935947, 39871894, 79743788, 99679735, 199359470, 398718940]

約数ペア:

[(1, 398718940), (2, 199359470), (4, 99679735), (5, 79743788), (10, 39871894), (20, 19935947), (991, 402340), (1982, 201170), (3964, 100585), (4955, 80468), (9910, 40234), (19820, 20117)]