21051261

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{821}}^1$

素因数の和:882

約数の個数: 48

約数和(自身を含む): 38982528

約数和(自身を除く): 17931267

約数列:

[1, 3, 7, 9, 11, 21, 33, 37, 63, 77, 99, 111, 231, 259, 333, 407, 693, 777, 821, 1221, 2331, 2463, 2849, 3663, 5747, 7389, 8547, 9031, 17241, 25641, 27093, 30377, 51723, 63217, 81279, 91131, 189651, 212639, 273393, 334147, 568953, 637917, 1002441, 1913751, 2339029, 3007323, 7017087, 21051261]

約数ペア:

[(1, 21051261), (3, 7017087), (7, 3007323), (9, 2339029), (11, 1913751), (21, 1002441), (33, 637917), (37, 568953), (63, 334147), (77, 273393), (99, 212639), (111, 189651), (231, 91131), (259, 81279), (333, 63217), (407, 51723), (693, 30377), (777, 27093), (821, 25641), (1221, 17241), (2331, 9031), (2463, 8547), (2849, 7389), (3663, 5747)]