21379580

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{12011}}^1$

素因数の和:12109

約数の個数: 24

約数和(自身を含む): 45405360

約数和(自身を除く): 24025780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 12011, 24022, 48044, 60055, 120110, 240220, 1068979, 2137958, 4275916, 5344895, 10689790, 21379580]

約数ペア:

[(1, 21379580), (2, 10689790), (4, 5344895), (5, 4275916), (10, 2137958), (20, 1068979), (89, 240220), (178, 120110), (356, 60055), (445, 48044), (890, 24022), (1780, 12011)]