21056841

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{19997}}^1$

素因数の和:20022

約数の個数: 20

約数和(自身を含む): 33876612

約数和(自身を除く): 12819771

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 351, 1053, 19997, 59991, 179973, 259961, 539919, 779883, 1619757, 2339649, 7018947, 21056841]

約数ペア:

[(1, 21056841), (3, 7018947), (9, 2339649), (13, 1619757), (27, 779883), (39, 539919), (81, 259961), (117, 179973), (351, 59991), (1053, 19997)]