21427905

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^2\times {\mathrm{4943}}^1$

素因数の和:4985

約数の個数: 24

約数和(自身を含む): 36427392

約数和(自身を除く): 14999487

約数列:

[1, 3, 5, 15, 17, 51, 85, 255, 289, 867, 1445, 4335, 4943, 14829, 24715, 74145, 84031, 252093, 420155, 1260465, 1428527, 4285581, 7142635, 21427905]

約数ペア:

[(1, 21427905), (3, 7142635), (5, 4285581), (15, 1428527), (17, 1260465), (51, 420155), (85, 252093), (255, 84031), (289, 74145), (867, 24715), (1445, 14829), (4335, 4943)]