21081825

素因数分解:

$3^2\times 5^2\times {\mathrm{43}}^1\times {\mathrm{2179}}^1$

素因数の和:2238

約数の個数: 36

約数和(自身を含む): 38655760

約数和(自身を除く): 17573935

約数列:

[1, 3, 5, 9, 15, 25, 43, 45, 75, 129, 215, 225, 387, 645, 1075, 1935, 2179, 3225, 6537, 9675, 10895, 19611, 32685, 54475, 93697, 98055, 163425, 281091, 468485, 490275, 843273, 1405455, 2342425, 4216365, 7027275, 21081825]

約数ペア:

[(1, 21081825), (3, 7027275), (5, 4216365), (9, 2342425), (15, 1405455), (25, 843273), (43, 490275), (45, 468485), (75, 281091), (129, 163425), (215, 98055), (225, 93697), (387, 54475), (645, 32685), (1075, 19611), (1935, 10895), (2179, 9675), (3225, 6537)]