66691420

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{81331}}^1$

素因数の和:81381

約数の個数: 24

約数和(自身を含む): 143469648

約数和(自身を除く): 76778228

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 81331, 162662, 325324, 406655, 813310, 1626620, 3334571, 6669142, 13338284, 16672855, 33345710, 66691420]

約数ペア:

[(1, 66691420), (2, 33345710), (4, 16672855), (5, 13338284), (10, 6669142), (20, 3334571), (41, 1626620), (82, 813310), (164, 406655), (205, 325324), (410, 162662), (820, 81331)]