21557475

素因数分解:

$3^3\times 5^2\times {\mathrm{109}}^1\times {\mathrm{293}}^1$

素因数の和:421

約数の個数: 48

約数和(自身を含む): 40101600

約数和(自身を除く): 18544125

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 109, 135, 225, 293, 327, 545, 675, 879, 981, 1465, 1635, 2637, 2725, 2943, 4395, 4905, 7325, 7911, 8175, 13185, 14715, 21975, 24525, 31937, 39555, 65925, 73575, 95811, 159685, 197775, 287433, 479055, 798425, 862299, 1437165, 2395275, 4311495, 7185825, 21557475]

約数ペア:

[(1, 21557475), (3, 7185825), (5, 4311495), (9, 2395275), (15, 1437165), (25, 862299), (27, 798425), (45, 479055), (75, 287433), (109, 197775), (135, 159685), (225, 95811), (293, 73575), (327, 65925), (545, 39555), (675, 31937), (879, 24525), (981, 21975), (1465, 14715), (1635, 13185), (2637, 8175), (2725, 7911), (2943, 7325), (4395, 4905)]