20521767

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^2\times {\mathrm{2707}}^1$

素因数の和:2755

約数の個数: 24

約数和(自身を含む): 33015936

約数和(自身を除く): 12494169

約数列:

[1, 3, 7, 19, 21, 57, 133, 361, 399, 1083, 2527, 2707, 7581, 8121, 18949, 51433, 56847, 154299, 360031, 977227, 1080093, 2931681, 6840589, 20521767]

約数ペア:

[(1, 20521767), (3, 6840589), (7, 2931681), (19, 1080093), (21, 977227), (57, 360031), (133, 154299), (361, 56847), (399, 51433), (1083, 18949), (2527, 8121), (2707, 7581)]