21009573

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{727}}^1$

素因数の和:778

約数の個数: 36

約数和(自身を含む): 34638240

約数和(自身を除く): 13628667

約数列:

[1, 3, 9, 13, 19, 39, 57, 117, 169, 171, 247, 507, 727, 741, 1521, 2181, 2223, 3211, 6543, 9451, 9633, 13813, 28353, 28899, 41439, 85059, 122863, 124317, 179569, 368589, 538707, 1105767, 1616121, 2334397, 7003191, 21009573]

約数ペア:

[(1, 21009573), (3, 7003191), (9, 2334397), (13, 1616121), (19, 1105767), (39, 538707), (57, 368589), (117, 179569), (169, 124317), (171, 122863), (247, 85059), (507, 41439), (727, 28899), (741, 28353), (1521, 13813), (2181, 9633), (2223, 9451), (3211, 6543)]