20990905

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{6871}}^1$

素因数の和:6936

約数の個数: 16

約数和(自身を含む): 27707904

約数和(自身を除く): 6716999

約数列:

[1, 5, 13, 47, 65, 235, 611, 3055, 6871, 34355, 89323, 322937, 446615, 1614685, 4198181, 20990905]

約数ペア:

[(1, 20990905), (5, 4198181), (13, 1614685), (47, 446615), (65, 322937), (235, 89323), (611, 34355), (3055, 6871)]