21089205

素因数分解:

$3^2\times 5^1\times {\mathrm{661}}^1\times {\mathrm{709}}^1$

素因数の和:1381

約数の個数: 24

約数和(自身を含む): 36661560

約数和(自身を除く): 15572355

約数列:

[1, 3, 5, 9, 15, 45, 661, 709, 1983, 2127, 3305, 3545, 5949, 6381, 9915, 10635, 29745, 31905, 468649, 1405947, 2343245, 4217841, 7029735, 21089205]

約数ペア:

[(1, 21089205), (3, 7029735), (5, 4217841), (9, 2343245), (15, 1405947), (45, 468649), (661, 31905), (709, 29745), (1983, 10635), (2127, 9915), (3305, 6381), (3545, 5949)]