21817240

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5623}}^1$

素因数の和:5731

約数の個数: 32

約数和(自身を含む): 49603680

約数和(自身を除く): 27786440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5623, 11246, 22492, 28115, 44984, 56230, 112460, 224920, 545431, 1090862, 2181724, 2727155, 4363448, 5454310, 10908620, 21817240]

約数ペア:

[(1, 21817240), (2, 10908620), (4, 5454310), (5, 4363448), (8, 2727155), (10, 2181724), (20, 1090862), (40, 545431), (97, 224920), (194, 112460), (388, 56230), (485, 44984), (776, 28115), (970, 22492), (1940, 11246), (3880, 5623)]