18238840

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2161}}^1$

素因数の和:2383

約数の個数: 32

約数和(自身を含む): 41250960

約数和(自身を除く): 23012120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2161, 4220, 4322, 8440, 8644, 10805, 17288, 21610, 43220, 86440, 455971, 911942, 1823884, 2279855, 3647768, 4559710, 9119420, 18238840]

約数ペア:

[(1, 18238840), (2, 9119420), (4, 4559710), (5, 3647768), (8, 2279855), (10, 1823884), (20, 911942), (40, 455971), (211, 86440), (422, 43220), (844, 21610), (1055, 17288), (1688, 10805), (2110, 8644), (2161, 8440), (4220, 4322)]