20886985

素因数分解:

$5^1\times 7^3\times {\mathrm{19}}^1\times {\mathrm{641}}^1$

素因数の和:686

約数の個数: 32

約数和(自身を含む): 30816000

約数和(自身を除く): 9929015

約数列:

[1, 5, 7, 19, 35, 49, 95, 133, 245, 343, 641, 665, 931, 1715, 3205, 4487, 4655, 6517, 12179, 22435, 31409, 32585, 60895, 85253, 157045, 219863, 426265, 596771, 1099315, 2983855, 4177397, 20886985]

約数ペア:

[(1, 20886985), (5, 4177397), (7, 2983855), (19, 1099315), (35, 596771), (49, 426265), (95, 219863), (133, 157045), (245, 85253), (343, 60895), (641, 32585), (665, 31409), (931, 22435), (1715, 12179), (3205, 6517), (4487, 4655)]