12720981

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{2741}}^1$

素因数の和:2781

約数の個数: 32

約数和(自身を含む): 22111488

約数和(自身を除く): 9390507

約数列:

[1, 3, 7, 13, 17, 21, 39, 51, 91, 119, 221, 273, 357, 663, 1547, 2741, 4641, 8223, 19187, 35633, 46597, 57561, 106899, 139791, 249431, 326179, 605761, 748293, 978537, 1817283, 4240327, 12720981]

約数ペア:

[(1, 12720981), (3, 4240327), (7, 1817283), (13, 978537), (17, 748293), (21, 605761), (39, 326179), (51, 249431), (91, 139791), (119, 106899), (221, 57561), (273, 46597), (357, 35633), (663, 19187), (1547, 8223), (2741, 4641)]