19808789

素因数分解:

$7^2\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{257}}^1$

素因数の和:306

約数の個数: 36

約数和(自身を含む): 27382572

約数和(自身を除く): 7573783

約数列:

[1, 7, 11, 13, 49, 77, 91, 121, 143, 257, 539, 637, 847, 1001, 1573, 1799, 2827, 3341, 5929, 7007, 11011, 12593, 19789, 23387, 31097, 36751, 77077, 138523, 163709, 217679, 257257, 404261, 1523753, 1800799, 2829827, 19808789]

約数ペア:

[(1, 19808789), (7, 2829827), (11, 1800799), (13, 1523753), (49, 404261), (77, 257257), (91, 217679), (121, 163709), (143, 138523), (257, 77077), (539, 36751), (637, 31097), (847, 23387), (1001, 19789), (1573, 12593), (1799, 11011), (2827, 7007), (3341, 5929)]