20820321

素因数分解:

$3^4\times {\mathrm{401}}^1\times {\mathrm{641}}^1$

素因数の和:1054

約数の個数: 20

約数和(自身を含む): 31228164

約数和(自身を除く): 10407843

約数列:

[1, 3, 9, 27, 81, 401, 641, 1203, 1923, 3609, 5769, 10827, 17307, 32481, 51921, 257041, 771123, 2313369, 6940107, 20820321]

約数ペア:

[(1, 20820321), (3, 6940107), (9, 2313369), (27, 771123), (81, 257041), (401, 51921), (641, 32481), (1203, 17307), (1923, 10827), (3609, 5769)]