21889989

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{20101}}^1$

素因数の和:20129

約数の個数: 18

約数和(自身を含む): 34756358

約数和(自身を除く): 12866369

約数列:

[1, 3, 9, 11, 33, 99, 121, 363, 1089, 20101, 60303, 180909, 221111, 663333, 1989999, 2432221, 7296663, 21889989]

約数ペア:

[(1, 21889989), (3, 7296663), (9, 2432221), (11, 1989999), (33, 663333), (99, 221111), (121, 180909), (363, 60303), (1089, 20101)]