18880280

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2237}}^1$

素因数の和:2459

約数の個数: 32

約数和(自身を含む): 42701040

約数和(自身を除く): 23820760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2237, 4220, 4474, 8440, 8948, 11185, 17896, 22370, 44740, 89480, 472007, 944014, 1888028, 2360035, 3776056, 4720070, 9440140, 18880280]

約数ペア:

[(1, 18880280), (2, 9440140), (4, 4720070), (5, 3776056), (8, 2360035), (10, 1888028), (20, 944014), (40, 472007), (211, 89480), (422, 44740), (844, 22370), (1055, 17896), (1688, 11185), (2110, 8948), (2237, 8440), (4220, 4474)]