20178680

素因数分解:

$2^3\times 5^1\times {\mathrm{641}}^1\times {\mathrm{787}}^1$

素因数の和:1439

約数の個数: 32

約数和(自身を含む): 45530640

約数和(自身を除く): 25351960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 641, 787, 1282, 1574, 2564, 3148, 3205, 3935, 5128, 6296, 6410, 7870, 12820, 15740, 25640, 31480, 504467, 1008934, 2017868, 2522335, 4035736, 5044670, 10089340, 20178680]

約数ペア:

[(1, 20178680), (2, 10089340), (4, 5044670), (5, 4035736), (8, 2522335), (10, 2017868), (20, 1008934), (40, 504467), (641, 31480), (787, 25640), (1282, 15740), (1574, 12820), (2564, 7870), (3148, 6410), (3205, 6296), (3935, 5128)]