21656385

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{28309}}^1$

素因数の和:28337

約数の個数: 24

約数和(自身を含む): 39747240

約数和(自身を除く): 18090855

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 28309, 84927, 141545, 254781, 424635, 481253, 1273905, 1443759, 2406265, 4331277, 7218795, 21656385]

約数ペア:

[(1, 21656385), (3, 7218795), (5, 4331277), (9, 2406265), (15, 1443759), (17, 1273905), (45, 481253), (51, 424635), (85, 254781), (153, 141545), (255, 84927), (765, 28309)]