20391890

素因数分解:

$2^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{1009}}^1$

素因数の和:1106

約数の個数: 32

約数和(自身を含む): 38396160

約数和(自身を除く): 18004270

約数列:

[1, 2, 5, 10, 43, 47, 86, 94, 215, 235, 430, 470, 1009, 2018, 2021, 4042, 5045, 10090, 10105, 20210, 43387, 47423, 86774, 94846, 216935, 237115, 433870, 474230, 2039189, 4078378, 10195945, 20391890]

約数ペア:

[(1, 20391890), (2, 10195945), (5, 4078378), (10, 2039189), (43, 474230), (47, 433870), (86, 237115), (94, 216935), (215, 94846), (235, 86774), (430, 47423), (470, 43387), (1009, 20210), (2018, 10105), (2021, 10090), (4042, 5045)]