21778281

素因数分解:

$3^3\times 7^1\times {\mathrm{61}}^1\times {\mathrm{1889}}^1$

素因数の和:1966

約数の個数: 32

約数和(自身を含む): 37497600

約数和(自身を除く): 15719319

約数列:

[1, 3, 7, 9, 21, 27, 61, 63, 183, 189, 427, 549, 1281, 1647, 1889, 3843, 5667, 11529, 13223, 17001, 39669, 51003, 115229, 119007, 345687, 357021, 806603, 1037061, 2419809, 3111183, 7259427, 21778281]

約数ペア:

[(1, 21778281), (3, 7259427), (7, 3111183), (9, 2419809), (21, 1037061), (27, 806603), (61, 357021), (63, 345687), (183, 119007), (189, 115229), (427, 51003), (549, 39669), (1281, 17001), (1647, 13223), (1889, 11529), (3843, 5667)]