81919019

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{409}}^1$

素因数の和:531

約数の個数: 32

約数和(自身を含む): 105799680

約数和(自身を除く): 23880661

約数列:

[1, 7, 13, 31, 71, 91, 217, 403, 409, 497, 923, 2201, 2821, 2863, 5317, 6461, 12679, 15407, 28613, 29039, 37219, 88753, 164827, 200291, 203273, 377507, 900209, 1153789, 2642549, 6301463, 11702717, 81919019]

約数ペア:

[(1, 81919019), (7, 11702717), (13, 6301463), (31, 2642549), (71, 1153789), (91, 900209), (217, 377507), (403, 203273), (409, 200291), (497, 164827), (923, 88753), (2201, 37219), (2821, 29039), (2863, 28613), (5317, 15407), (6461, 12679)]