21642760

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12583}}^1$

素因数の和:12637

約数の個数: 32

約数和(自身を含む): 49832640

約数和(自身を除く): 28189880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12583, 25166, 50332, 62915, 100664, 125830, 251660, 503320, 541069, 1082138, 2164276, 2705345, 4328552, 5410690, 10821380, 21642760]

約数ペア:

[(1, 21642760), (2, 10821380), (4, 5410690), (5, 4328552), (8, 2705345), (10, 2164276), (20, 1082138), (40, 541069), (43, 503320), (86, 251660), (172, 125830), (215, 100664), (344, 62915), (430, 50332), (860, 25166), (1720, 12583)]