21491271

素因数分解:

$3^3\times {\mathrm{43}}^1\times {\mathrm{107}}^1\times {\mathrm{173}}^1$

素因数の和:332

約数の個数: 32

約数和(自身を含む): 33073920

約数和(自身を除く): 11582649

約数列:

[1, 3, 9, 27, 43, 107, 129, 173, 321, 387, 519, 963, 1161, 1557, 2889, 4601, 4671, 7439, 13803, 18511, 22317, 41409, 55533, 66951, 124227, 166599, 200853, 499797, 795973, 2387919, 7163757, 21491271]

約数ペア:

[(1, 21491271), (3, 7163757), (9, 2387919), (27, 795973), (43, 499797), (107, 200853), (129, 166599), (173, 124227), (321, 66951), (387, 55533), (519, 41409), (963, 22317), (1161, 18511), (1557, 13803), (2889, 7439), (4601, 4671)]