21988989

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1$

素因数の和:112

約数の個数: 80

約数和(自身を含む): 39726720

約数和(自身を除く): 17737731

約数列:

[1, 3, 9, 11, 23, 27, 29, 33, 37, 69, 81, 87, 99, 111, 207, 253, 261, 297, 319, 333, 407, 621, 667, 759, 783, 851, 891, 957, 999, 1073, 1221, 1863, 2001, 2277, 2349, 2553, 2871, 2997, 3219, 3663, 6003, 6831, 7337, 7659, 8613, 9361, 9657, 10989, 11803, 18009, 20493, 22011, 22977, 24679, 25839, 28083, 28971, 32967, 35409, 54027, 66033, 68931, 74037, 84249, 86913, 106227, 198099, 222111, 252747, 271469, 318681, 594297, 666333, 758241, 814407, 956043, 1998999, 2443221, 7329663, 21988989]

約数ペア:

[(1, 21988989), (3, 7329663), (9, 2443221), (11, 1998999), (23, 956043), (27, 814407), (29, 758241), (33, 666333), (37, 594297), (69, 318681), (81, 271469), (87, 252747), (99, 222111), (111, 198099), (207, 106227), (253, 86913), (261, 84249), (297, 74037), (319, 68931), (333, 66033), (407, 54027), (621, 35409), (667, 32967), (759, 28971), (783, 28083), (851, 25839), (891, 24679), (957, 22977), (999, 22011), (1073, 20493), (1221, 18009), (1863, 11803), (2001, 10989), (2277, 9657), (2349, 9361), (2553, 8613), (2871, 7659), (2997, 7337), (3219, 6831), (3663, 6003)]