21393841

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{463}}^1$

素因数の和:541

約数の個数: 24

約数和(自身を含む): 26659584

約数和(自身を除く): 5265743

約数列:

[1, 7, 23, 41, 49, 161, 287, 463, 943, 1127, 2009, 3241, 6601, 10649, 18983, 22687, 46207, 74543, 132881, 436609, 521801, 930167, 3056263, 21393841]

約数ペア:

[(1, 21393841), (7, 3056263), (23, 930167), (41, 521801), (49, 436609), (161, 132881), (287, 74543), (463, 46207), (943, 22687), (1127, 18983), (2009, 10649), (3241, 6601)]