20991340

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{33857}}^1$

素因数の和:33897

約数の個数: 24

約数和(自身を含む): 45505152

約数和(自身を除く): 24513812

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 33857, 67714, 135428, 169285, 338570, 677140, 1049567, 2099134, 4198268, 5247835, 10495670, 20991340]

約数ペア:

[(1, 20991340), (2, 10495670), (4, 5247835), (5, 4198268), (10, 2099134), (20, 1049567), (31, 677140), (62, 338570), (124, 169285), (155, 135428), (310, 67714), (620, 33857)]