21791990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{198109}}^1$

素因数の和:198127

約数の個数: 16

約数和(自身を含む): 42791760

約数和(自身を除く): 20999770

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 198109, 396218, 990545, 1981090, 2179199, 4358398, 10895995, 21791990]

約数ペア:

[(1, 21791990), (2, 10895995), (5, 4358398), (10, 2179199), (11, 1981090), (22, 990545), (55, 396218), (110, 198109)]