21005721

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{19289}}^1$

素因数の和:19317

約数の個数: 18

約数和(自身を含む): 33352410

約数和(自身を除く): 12346689

約数列:

[1, 3, 9, 11, 33, 99, 121, 363, 1089, 19289, 57867, 173601, 212179, 636537, 1909611, 2333969, 7001907, 21005721]

約数ペア:

[(1, 21005721), (3, 7001907), (9, 2333969), (11, 1909611), (33, 636537), (99, 212179), (121, 173601), (363, 57867), (1089, 19289)]