81607780

素因数分解:

$2^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{15877}}^1$

素因数の和:16143

約数の個数: 24

約数和(自身を含む): 172054008

約数和(自身を除く): 90446228

約数列:

[1, 2, 4, 5, 10, 20, 257, 514, 1028, 1285, 2570, 5140, 15877, 31754, 63508, 79385, 158770, 317540, 4080389, 8160778, 16321556, 20401945, 40803890, 81607780]

約数ペア:

[(1, 81607780), (2, 40803890), (4, 20401945), (5, 16321556), (10, 8160778), (20, 4080389), (257, 317540), (514, 158770), (1028, 79385), (1285, 63508), (2570, 31754), (5140, 15877)]