20405907

素因数分解:

$3^2\times {\mathrm{37}}^1\times {\mathrm{233}}^1\times {\mathrm{263}}^1$

素因数の和:539

約数の個数: 24

約数和(自身を含む): 30517344

約数和(自身を除く): 10111437

約数列:

[1, 3, 9, 37, 111, 233, 263, 333, 699, 789, 2097, 2367, 8621, 9731, 25863, 29193, 61279, 77589, 87579, 183837, 551511, 2267323, 6801969, 20405907]

約数ペア:

[(1, 20405907), (3, 6801969), (9, 2267323), (37, 551511), (111, 183837), (233, 87579), (263, 77589), (333, 61279), (699, 29193), (789, 25863), (2097, 9731), (2367, 8621)]