81257900

素因数分解:

$2^2\times 5^2\times {\mathrm{41}}^1\times {\mathrm{19819}}^1$

素因数の和:19874

約数の個数: 36

約数和(自身を含む): 180639480

約数和(自身を除く): 99381580

約数列:

[1, 2, 4, 5, 10, 20, 25, 41, 50, 82, 100, 164, 205, 410, 820, 1025, 2050, 4100, 19819, 39638, 79276, 99095, 198190, 396380, 495475, 812579, 990950, 1625158, 1981900, 3250316, 4062895, 8125790, 16251580, 20314475, 40628950, 81257900]

約数ペア:

[(1, 81257900), (2, 40628950), (4, 20314475), (5, 16251580), (10, 8125790), (20, 4062895), (25, 3250316), (41, 1981900), (50, 1625158), (82, 990950), (100, 812579), (164, 495475), (205, 396380), (410, 198190), (820, 99095), (1025, 79276), (2050, 39638), (4100, 19819)]