21631640

素因数分解:

$2^3\times 5^1\times {\mathrm{479}}^1\times {\mathrm{1129}}^1$

素因数の和:1619

約数の個数: 32

約数和(自身を含む): 48816000

約数和(自身を除く): 27184360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 479, 958, 1129, 1916, 2258, 2395, 3832, 4516, 4790, 5645, 9032, 9580, 11290, 19160, 22580, 45160, 540791, 1081582, 2163164, 2703955, 4326328, 5407910, 10815820, 21631640]

約数ペア:

[(1, 21631640), (2, 10815820), (4, 5407910), (5, 4326328), (8, 2703955), (10, 2163164), (20, 1081582), (40, 540791), (479, 45160), (958, 22580), (1129, 19160), (1916, 11290), (2258, 9580), (2395, 9032), (3832, 5645), (4516, 4790)]