21013993

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{2999}}^1$

素因数の和:3037

約数の個数: 24

約数和(自身を含む): 28728000

約数和(自身を除く): 7714007

約数列:

[1, 7, 11, 13, 49, 77, 91, 143, 539, 637, 1001, 2999, 7007, 20993, 32989, 38987, 146951, 230923, 272909, 428857, 1616461, 1910363, 3001999, 21013993]

約数ペア:

[(1, 21013993), (7, 3001999), (11, 1910363), (13, 1616461), (49, 428857), (77, 272909), (91, 230923), (143, 146951), (539, 38987), (637, 32989), (1001, 20993), (2999, 7007)]