21389805

素因数分解:

$3^3\times 5^1\times {\mathrm{158443}}^1$

素因数の和:158457

約数の個数: 16

約数和(自身を含む): 38026560

約数和(自身を除く): 16636755

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 158443, 475329, 792215, 1425987, 2376645, 4277961, 7129935, 21389805]

約数ペア:

[(1, 21389805), (3, 7129935), (5, 4277961), (9, 2376645), (15, 1425987), (27, 792215), (45, 475329), (135, 158443)]