21007217

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{83}}^1\times {\mathrm{173}}^1$

素因数の和:293

約数の個数: 32

約数和(自身を含む): 28062720

約数和(自身を除く): 7055503

約数列:

[1, 7, 11, 19, 77, 83, 133, 173, 209, 581, 913, 1211, 1463, 1577, 1903, 3287, 6391, 11039, 13321, 14359, 17347, 23009, 36157, 100513, 121429, 157949, 253099, 272821, 1105643, 1909747, 3001031, 21007217]

約数ペア:

[(1, 21007217), (7, 3001031), (11, 1909747), (19, 1105643), (77, 272821), (83, 253099), (133, 157949), (173, 121429), (209, 100513), (581, 36157), (913, 23009), (1211, 17347), (1463, 14359), (1577, 13321), (1903, 11039), (3287, 6391)]