18811640

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{10937}}^1$

素因数の和:10991

約数の個数: 32

約数和(自身を含む): 43314480

約数和(自身を除く): 24502840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 10937, 21874, 43748, 54685, 87496, 109370, 218740, 437480, 470291, 940582, 1881164, 2351455, 3762328, 4702910, 9405820, 18811640]

約数ペア:

[(1, 18811640), (2, 9405820), (4, 4702910), (5, 3762328), (8, 2351455), (10, 1881164), (20, 940582), (40, 470291), (43, 437480), (86, 218740), (172, 109370), (215, 87496), (344, 54685), (430, 43748), (860, 21874), (1720, 10937)]