21420889

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{83}}^1\times {\mathrm{229}}^1$

素因数の和:349

約数の個数: 24

約数和(自身を含む): 26429760

約数和(自身を除く): 5008871

約数列:

[1, 7, 23, 49, 83, 161, 229, 581, 1127, 1603, 1909, 4067, 5267, 11221, 13363, 19007, 36869, 93541, 133049, 258083, 437161, 931343, 3060127, 21420889]

約数ペア:

[(1, 21420889), (7, 3060127), (23, 931343), (49, 437161), (83, 258083), (161, 133049), (229, 93541), (581, 36869), (1127, 19007), (1603, 13363), (1909, 11221), (4067, 5267)]