21681621

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{223}}^1\times {\mathrm{277}}^1$

素因数の和:522

約数の個数: 32

約数和(自身を含む): 34872320

約数和(自身を除く): 13190699

約数列:

[1, 3, 9, 13, 27, 39, 117, 223, 277, 351, 669, 831, 2007, 2493, 2899, 3601, 6021, 7479, 8697, 10803, 26091, 32409, 61771, 78273, 97227, 185313, 555939, 803023, 1667817, 2409069, 7227207, 21681621]

約数ペア:

[(1, 21681621), (3, 7227207), (9, 2409069), (13, 1667817), (27, 803023), (39, 555939), (117, 185313), (223, 97227), (277, 78273), (351, 61771), (669, 32409), (831, 26091), (2007, 10803), (2493, 8697), (2899, 7479), (3601, 6021)]