18720843518

素因数分解:

$2^1\times {\mathrm{13}}^3\times {\mathrm{31}}^1\times {\mathrm{137437}}^1$

素因数の和:137509

約数の個数: 32

約数和(自身を含む): 31401834240

約数和(自身を除く): 12680990722

約数列:

[1, 2, 13, 26, 31, 62, 169, 338, 403, 806, 2197, 4394, 5239, 10478, 68107, 136214, 137437, 274874, 1786681, 3573362, 4260547, 8521094, 23226853, 46453706, 55387111, 110774222, 301949089, 603898178, 720032443, 1440064886, 9360421759, 18720843518]

約数ペア:

[(1, 18720843518), (2, 9360421759), (13, 1440064886), (26, 720032443), (31, 603898178), (62, 301949089), (169, 110774222), (338, 55387111), (403, 46453706), (806, 23226853), (2197, 8521094), (4394, 4260547), (5239, 3573362), (10478, 1786681), (68107, 274874), (136214, 137437)]