20509767

素因数分解:

$3^4\times {\mathrm{23}}^1\times {\mathrm{101}}^1\times {\mathrm{109}}^1$

素因数の和:245

約数の個数: 40

約数和(自身を含む): 32582880

約数和(自身を除く): 12073113

約数列:

[1, 3, 9, 23, 27, 69, 81, 101, 109, 207, 303, 327, 621, 909, 981, 1863, 2323, 2507, 2727, 2943, 6969, 7521, 8181, 8829, 11009, 20907, 22563, 33027, 62721, 67689, 99081, 188163, 203067, 253207, 297243, 759621, 891729, 2278863, 6836589, 20509767]

約数ペア:

[(1, 20509767), (3, 6836589), (9, 2278863), (23, 891729), (27, 759621), (69, 297243), (81, 253207), (101, 203067), (109, 188163), (207, 99081), (303, 67689), (327, 62721), (621, 33027), (909, 22563), (981, 20907), (1863, 11009), (2323, 8829), (2507, 8181), (2727, 7521), (2943, 6969)]