12871280

素因数分解:

$2^4\times 5^1\times {\mathrm{251}}^1\times {\mathrm{641}}^1$

素因数の和:905

約数の個数: 40

約数和(自身を含む): 30091824

約数和(自身を除く): 17220544

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 251, 502, 641, 1004, 1255, 1282, 2008, 2510, 2564, 3205, 4016, 5020, 5128, 6410, 10040, 10256, 12820, 20080, 25640, 51280, 160891, 321782, 643564, 804455, 1287128, 1608910, 2574256, 3217820, 6435640, 12871280]

約数ペア:

[(1, 12871280), (2, 6435640), (4, 3217820), (5, 2574256), (8, 1608910), (10, 1287128), (16, 804455), (20, 643564), (40, 321782), (80, 160891), (251, 51280), (502, 25640), (641, 20080), (1004, 12820), (1255, 10256), (1282, 10040), (2008, 6410), (2510, 5128), (2564, 5020), (3205, 4016)]