21189380

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{13411}}^1$

素因数の和:13499

約数の個数: 24

約数和(自身を含む): 45064320

約数和(自身を除く): 23874940

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 13411, 26822, 53644, 67055, 134110, 268220, 1059469, 2118938, 4237876, 5297345, 10594690, 21189380]

約数ペア:

[(1, 21189380), (2, 10594690), (4, 5297345), (5, 4237876), (10, 2118938), (20, 1059469), (79, 268220), (158, 134110), (316, 67055), (395, 53644), (790, 26822), (1580, 13411)]