21979321

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{137}}^1$

素因数の和:241

約数の個数: 32

約数和(自身を含む): 28562688

約数和(自身を除く): 6583367

約数列:

[1, 7, 13, 41, 43, 91, 137, 287, 301, 533, 559, 959, 1763, 1781, 3731, 3913, 5617, 5891, 12341, 12467, 22919, 39319, 41237, 73021, 76583, 160433, 241531, 511147, 536081, 1690717, 3139903, 21979321]

約数ペア:

[(1, 21979321), (7, 3139903), (13, 1690717), (41, 536081), (43, 511147), (91, 241531), (137, 160433), (287, 76583), (301, 73021), (533, 41237), (559, 39319), (959, 22919), (1763, 12467), (1781, 12341), (3731, 5891), (3913, 5617)]