20921787

素因数分解:

$3^3\times {\mathrm{109}}^1\times {\mathrm{7109}}^1$

素因数の和:7227

約数の個数: 16

約数和(自身を含む): 31284000

約数和(自身を除く): 10362213

約数列:

[1, 3, 9, 27, 109, 327, 981, 2943, 7109, 21327, 63981, 191943, 774881, 2324643, 6973929, 20921787]

約数ペア:

[(1, 20921787), (3, 6973929), (9, 2324643), (27, 774881), (109, 191943), (327, 63981), (981, 21327), (2943, 7109)]