18720945

素因数分解:

$3^2\times 5^1\times {\mathrm{643}}^1\times {\mathrm{647}}^1$

素因数の和:1301

約数の個数: 24

約数和(自身を含む): 32550336

約数和(自身を除く): 13829391

約数列:

[1, 3, 5, 9, 15, 45, 643, 647, 1929, 1941, 3215, 3235, 5787, 5823, 9645, 9705, 28935, 29115, 416021, 1248063, 2080105, 3744189, 6240315, 18720945]

約数ペア:

[(1, 18720945), (3, 6240315), (5, 3744189), (9, 2080105), (15, 1248063), (45, 416021), (643, 29115), (647, 28935), (1929, 9705), (1941, 9645), (3215, 5823), (3235, 5787)]