201991490

素因数分解:

$2^1\times 5^1\times {\mathrm{157}}^1\times {\mathrm{128657}}^1$

素因数の和:128821

約数の個数: 16

約数和(自身を含む): 365903352

約数和(自身を除く): 163911862

約数列:

[1, 2, 5, 10, 157, 314, 785, 1570, 128657, 257314, 643285, 1286570, 20199149, 40398298, 100995745, 201991490]

約数ペア:

[(1, 201991490), (2, 100995745), (5, 40398298), (10, 20199149), (157, 1286570), (314, 643285), (785, 257314), (1570, 128657)]