81285140

素因数分解:

$2^2\times 5^1\times {\mathrm{317}}^1\times {\mathrm{12821}}^1$

素因数の和:13147

約数の個数: 24

約数和(自身を含む): 171250632

約数和(自身を除く): 89965492

約数列:

[1, 2, 4, 5, 10, 20, 317, 634, 1268, 1585, 3170, 6340, 12821, 25642, 51284, 64105, 128210, 256420, 4064257, 8128514, 16257028, 20321285, 40642570, 81285140]

約数ペア:

[(1, 81285140), (2, 40642570), (4, 20321285), (5, 16257028), (10, 8128514), (20, 4064257), (317, 256420), (634, 128210), (1268, 64105), (1585, 51284), (3170, 25642), (6340, 12821)]