257020

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{181}}^1$

素因数の和:261

約数の個数: 24

約数和(自身を含む): 550368

約数和(自身を除く): 293348

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 181, 284, 355, 362, 710, 724, 905, 1420, 1810, 3620, 12851, 25702, 51404, 64255, 128510, 257020]

約数ペア:

[(1, 257020), (2, 128510), (4, 64255), (5, 51404), (10, 25702), (20, 12851), (71, 3620), (142, 1810), (181, 1420), (284, 905), (355, 724), (362, 710)]