51280

素因数分解:

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

素因数の和:654

約数の個数: 20

約数和(自身を含む): 119412

約数和(自身を除く): 68132

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 641, 1282, 2564, 3205, 5128, 6410, 10256, 12820, 25640, 51280]

約数ペア:

[(1, 51280), (2, 25640), (4, 12820), (5, 10256), (8, 6410), (10, 5128), (16, 3205), (20, 2564), (40, 1282), (80, 641)]