20191221

素因数分解:

$3^3\times {\mathrm{29}}^1\times {\mathrm{107}}^1\times {\mathrm{241}}^1$

素因数の和:386

約数の個数: 32

約数和(自身を含む): 31363200

約数和(自身を除く): 11171979

約数列:

[1, 3, 9, 27, 29, 87, 107, 241, 261, 321, 723, 783, 963, 2169, 2889, 3103, 6507, 6989, 9309, 20967, 25787, 27927, 62901, 77361, 83781, 188703, 232083, 696249, 747823, 2243469, 6730407, 20191221]

約数ペア:

[(1, 20191221), (3, 6730407), (9, 2243469), (27, 747823), (29, 696249), (87, 232083), (107, 188703), (241, 83781), (261, 77361), (321, 62901), (723, 27927), (783, 25787), (963, 20967), (2169, 9309), (2889, 6989), (3103, 6507)]