18987745

素因数分解:

$5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{4079}}^1$

素因数の和:4117

約数の個数: 24

約数和(自身を含む): 27907200

約数和(自身を除く): 8919455

約数列:

[1, 5, 7, 19, 35, 49, 95, 133, 245, 665, 931, 4079, 4655, 20395, 28553, 77501, 142765, 199871, 387505, 542507, 999355, 2712535, 3797549, 18987745]

約数ペア:

[(1, 18987745), (5, 3797549), (7, 2712535), (19, 999355), (35, 542507), (49, 387505), (95, 199871), (133, 142765), (245, 77501), (665, 28553), (931, 20395), (4079, 4655)]