21005621

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{12149}}^1$

素因数の和:12188

約数の個数: 16

約数和(自身を含む): 27216000

約数和(自身を除く): 6210379

約数列:

[1, 7, 13, 19, 91, 133, 247, 1729, 12149, 85043, 157937, 230831, 1105559, 1615817, 3000803, 21005621]

約数ペア:

[(1, 21005621), (7, 3000803), (13, 1615817), (19, 1105559), (91, 230831), (133, 157937), (247, 85043), (1729, 12149)]