21128913

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{419}}^1\times {\mathrm{431}}^1$

素因数の和:869

約数の個数: 24

約数和(自身を含む): 33022080

約数和(自身を除く): 11893167

約数列:

[1, 3, 9, 13, 39, 117, 419, 431, 1257, 1293, 3771, 3879, 5447, 5603, 16341, 16809, 49023, 50427, 180589, 541767, 1625301, 2347657, 7042971, 21128913]

約数ペア:

[(1, 21128913), (3, 7042971), (9, 2347657), (13, 1625301), (39, 541767), (117, 180589), (419, 50427), (431, 49023), (1257, 16809), (1293, 16341), (3771, 5603), (3879, 5447)]