19991655

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{12007}}^1$

素因数の和:12055

約数の個数: 24

約数和(自身を含む): 35591712

約数和(自身を除く): 15600057

約数列:

[1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555, 1665, 12007, 36021, 60035, 108063, 180105, 444259, 540315, 1332777, 2221295, 3998331, 6663885, 19991655]

約数ペア:

[(1, 19991655), (3, 6663885), (5, 3998331), (9, 2221295), (15, 1332777), (37, 540315), (45, 444259), (111, 180105), (185, 108063), (333, 60035), (555, 36021), (1665, 12007)]