20991609

素因数分解:

$3^3\times {\mathrm{239}}^1\times {\mathrm{3253}}^1$

素因数の和:3501

約数の個数: 16

約数和(自身を含む): 31238400

約数和(自身を除く): 10246791

約数列:

[1, 3, 9, 27, 239, 717, 2151, 3253, 6453, 9759, 29277, 87831, 777467, 2332401, 6997203, 20991609]

約数ペア:

[(1, 20991609), (3, 6997203), (9, 2332401), (27, 777467), (239, 87831), (717, 29277), (2151, 9759), (3253, 6453)]