20866005

素因数分解:

$3^4\times 5^1\times {\mathrm{51521}}^1$

素因数の和:51538

約数の個数: 20

約数和(自身を含む): 37404972

約数和(自身を除く): 16538967

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 51521, 154563, 257605, 463689, 772815, 1391067, 2318445, 4173201, 6955335, 20866005]

約数ペア:

[(1, 20866005), (3, 6955335), (5, 4173201), (9, 2318445), (15, 1391067), (27, 772815), (45, 463689), (81, 257605), (135, 154563), (405, 51521)]