18388640

素因数分解:

$2^5\times 5^1\times {\mathrm{281}}^1\times {\mathrm{409}}^1$

素因数の和:705

約数の個数: 48

約数和(自身を含む): 43704360

約数和(自身を除く): 25315720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 281, 409, 562, 818, 1124, 1405, 1636, 2045, 2248, 2810, 3272, 4090, 4496, 5620, 6544, 8180, 8992, 11240, 13088, 16360, 22480, 32720, 44960, 65440, 114929, 229858, 459716, 574645, 919432, 1149290, 1838864, 2298580, 3677728, 4597160, 9194320, 18388640]

約数ペア:

[(1, 18388640), (2, 9194320), (4, 4597160), (5, 3677728), (8, 2298580), (10, 1838864), (16, 1149290), (20, 919432), (32, 574645), (40, 459716), (80, 229858), (160, 114929), (281, 65440), (409, 44960), (562, 32720), (818, 22480), (1124, 16360), (1405, 13088), (1636, 11240), (2045, 8992), (2248, 8180), (2810, 6544), (3272, 5620), (4090, 4496)]