21538990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{195809}}^1$

素因数の和:195827

約数の個数: 16

約数和(自身を含む): 42294960

約数和(自身を除く): 20755970

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 195809, 391618, 979045, 1958090, 2153899, 4307798, 10769495, 21538990]

約数ペア:

[(1, 21538990), (2, 10769495), (5, 4307798), (10, 2153899), (11, 1958090), (22, 979045), (55, 391618), (110, 195809)]