21905559

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{293}}^1$

素因数の和:389

約数の個数: 40

約数和(自身を含む): 35858592

約数和(自身を除く): 13953033

約数列:

[1, 3, 9, 13, 27, 39, 71, 81, 117, 213, 293, 351, 639, 879, 923, 1053, 1917, 2637, 2769, 3809, 5751, 7911, 8307, 11427, 20803, 23733, 24921, 34281, 62409, 74763, 102843, 187227, 270439, 308529, 561681, 811317, 1685043, 2433951, 7301853, 21905559]

約数ペア:

[(1, 21905559), (3, 7301853), (9, 2433951), (13, 1685043), (27, 811317), (39, 561681), (71, 308529), (81, 270439), (117, 187227), (213, 102843), (293, 74763), (351, 62409), (639, 34281), (879, 24921), (923, 23733), (1053, 20803), (1917, 11427), (2637, 8307), (2769, 7911), (3809, 5751)]