20915901

素因数分解:

$3^4\times {\mathrm{23}}^1\times {\mathrm{103}}^1\times {\mathrm{109}}^1$

素因数の和:247

約数の個数: 40

約数和(自身を含む): 33221760

約数和(自身を除く): 12305859

約数列:

[1, 3, 9, 23, 27, 69, 81, 103, 109, 207, 309, 327, 621, 927, 981, 1863, 2369, 2507, 2781, 2943, 7107, 7521, 8343, 8829, 11227, 21321, 22563, 33681, 63963, 67689, 101043, 191889, 203067, 258221, 303129, 774663, 909387, 2323989, 6971967, 20915901]

約数ペア:

[(1, 20915901), (3, 6971967), (9, 2323989), (23, 909387), (27, 774663), (69, 303129), (81, 258221), (103, 203067), (109, 191889), (207, 101043), (309, 67689), (327, 63963), (621, 33681), (927, 22563), (981, 21321), (1863, 11227), (2369, 8829), (2507, 8343), (2781, 7521), (2943, 7107)]