81385880

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{28657}}^1$

素因数の和:28739

約数の個数: 32

約数和(自身を含む): 185703840

約数和(自身を除く): 104317960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 28657, 57314, 114628, 143285, 229256, 286570, 573140, 1146280, 2034647, 4069294, 8138588, 10173235, 16277176, 20346470, 40692940, 81385880]

約数ペア:

[(1, 81385880), (2, 40692940), (4, 20346470), (5, 16277176), (8, 10173235), (10, 8138588), (20, 4069294), (40, 2034647), (71, 1146280), (142, 573140), (284, 286570), (355, 229256), (568, 143285), (710, 114628), (1420, 57314), (2840, 28657)]