21005919

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{107}}^1\times {\mathrm{661}}^1$

素因数の和:788

約数の個数: 32

約数和(自身を含む): 34318080

約数和(自身を除く): 13312161

約数列:

[1, 3, 9, 11, 27, 33, 99, 107, 297, 321, 661, 963, 1177, 1983, 2889, 3531, 5949, 7271, 10593, 17847, 21813, 31779, 65439, 70727, 196317, 212181, 636543, 777997, 1909629, 2333991, 7001973, 21005919]

約数ペア:

[(1, 21005919), (3, 7001973), (9, 2333991), (11, 1909629), (27, 777997), (33, 636543), (99, 212181), (107, 196317), (297, 70727), (321, 65439), (661, 31779), (963, 21813), (1177, 17847), (1983, 10593), (2889, 7271), (3531, 5949)]