18971901

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{419}}^1$

素因数の和:487

約数の個数: 40

約数和(自身を含む): 31305120

約数和(自身を除く): 12333219

約数列:

[1, 3, 9, 13, 27, 39, 43, 81, 117, 129, 351, 387, 419, 559, 1053, 1161, 1257, 1677, 3483, 3771, 5031, 5447, 11313, 15093, 16341, 18017, 33939, 45279, 49023, 54051, 147069, 162153, 234221, 441207, 486459, 702663, 1459377, 2107989, 6323967, 18971901]

約数ペア:

[(1, 18971901), (3, 6323967), (9, 2107989), (13, 1459377), (27, 702663), (39, 486459), (43, 441207), (81, 234221), (117, 162153), (129, 147069), (351, 54051), (387, 49023), (419, 45279), (559, 33939), (1053, 18017), (1161, 16341), (1257, 15093), (1677, 11313), (3483, 5447), (3771, 5031)]