21316455

素因数分解:

$3^2\times 5^1\times {\mathrm{641}}^1\times {\mathrm{739}}^1$

素因数の和:1391

約数の個数: 24

約数和(自身を含む): 37056240

約数和(自身を除く): 15739785

約数列:

[1, 3, 5, 9, 15, 45, 641, 739, 1923, 2217, 3205, 3695, 5769, 6651, 9615, 11085, 28845, 33255, 473699, 1421097, 2368495, 4263291, 7105485, 21316455]

約数ペア:

[(1, 21316455), (3, 7105485), (5, 4263291), (9, 2368495), (15, 1421097), (45, 473699), (641, 33255), (739, 28845), (1923, 11085), (2217, 9615), (3205, 6651), (3695, 5769)]