21900021

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{719}}^1$

素因数の和:817

約数の個数: 32

約数和(自身を含む): 34836480

約数和(自身を除く): 12936459

約数列:

[1, 3, 11, 13, 33, 39, 71, 143, 213, 429, 719, 781, 923, 2157, 2343, 2769, 7909, 9347, 10153, 23727, 28041, 30459, 51049, 102817, 153147, 308451, 561539, 663637, 1684617, 1990911, 7300007, 21900021]

約数ペア:

[(1, 21900021), (3, 7300007), (11, 1990911), (13, 1684617), (33, 663637), (39, 561539), (71, 308451), (143, 153147), (213, 102817), (429, 51049), (719, 30459), (781, 28041), (923, 23727), (2157, 10153), (2343, 9347), (2769, 7909)]