18947800

素因数分解:

$2^3\times 5^2\times {\mathrm{211}}^1\times {\mathrm{449}}^1$

素因数の和:676

約数の個数: 48

約数和(自身を含む): 44361000

約数和(自身を除く): 25413200

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 211, 422, 449, 844, 898, 1055, 1688, 1796, 2110, 2245, 3592, 4220, 4490, 5275, 8440, 8980, 10550, 11225, 17960, 21100, 22450, 42200, 44900, 89800, 94739, 189478, 378956, 473695, 757912, 947390, 1894780, 2368475, 3789560, 4736950, 9473900, 18947800]

約数ペア:

[(1, 18947800), (2, 9473900), (4, 4736950), (5, 3789560), (8, 2368475), (10, 1894780), (20, 947390), (25, 757912), (40, 473695), (50, 378956), (100, 189478), (200, 94739), (211, 89800), (422, 44900), (449, 42200), (844, 22450), (898, 21100), (1055, 17960), (1688, 11225), (1796, 10550), (2110, 8980), (2245, 8440), (3592, 5275), (4220, 4490)]