21820185

素因数分解:

$3^5\times 5^1\times {\mathrm{17959}}^1$

素因数の和:17979

約数の個数: 24

約数和(自身を含む): 39224640

約数和(自身を除く): 17404455

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215, 17959, 53877, 89795, 161631, 269385, 484893, 808155, 1454679, 2424465, 4364037, 7273395, 21820185]

約数ペア:

[(1, 21820185), (3, 7273395), (5, 4364037), (9, 2424465), (15, 1454679), (27, 808155), (45, 484893), (81, 269385), (135, 161631), (243, 89795), (405, 53877), (1215, 17959)]