20640123

素因数分解:

$3^3\times 7^2\times {\mathrm{15601}}^1$

素因数の和:15624

約数の個数: 24

約数和(自身を含む): 35572560

約数和(自身を除く): 14932437

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 1323, 15601, 46803, 109207, 140409, 327621, 421227, 764449, 982863, 2293347, 2948589, 6880041, 20640123]

約数ペア:

[(1, 20640123), (3, 6880041), (7, 2948589), (9, 2293347), (21, 982863), (27, 764449), (49, 421227), (63, 327621), (147, 140409), (189, 109207), (441, 46803), (1323, 15601)]