19991257

素因数分解:

${\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{179}}^1$

素因数の和:285

約数の個数: 24

約数和(自身を含む): 24131520

約数和(自身を除く): 4140263

約数列:

[1, 11, 13, 71, 121, 143, 179, 781, 923, 1573, 1969, 2327, 8591, 10153, 12709, 21659, 25597, 111683, 139799, 165217, 281567, 1537789, 1817387, 19991257]

約数ペア:

[(1, 19991257), (11, 1817387), (13, 1537789), (71, 281567), (121, 165217), (143, 139799), (179, 111683), (781, 25597), (923, 21659), (1573, 12709), (1969, 10153), (2327, 8591)]