257517

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1$

素因数の和:121

約数の個数: 24

約数和(自身を含む): 419328

約数和(自身を除く): 161811

約数列:

[1, 3, 9, 13, 31, 39, 71, 93, 117, 213, 279, 403, 639, 923, 1209, 2201, 2769, 3627, 6603, 8307, 19809, 28613, 85839, 257517]

約数ペア:

[(1, 257517), (3, 85839), (9, 28613), (13, 19809), (31, 8307), (39, 6603), (71, 3627), (93, 2769), (117, 2201), (213, 1209), (279, 923), (403, 639)]