20778009

素因数分解:

$3^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{1321}}^1$

素因数の和:1445

約数の個数: 24

約数和(自身を含む): 32552928

約数和(自身を除く): 11774919

約数列:

[1, 3, 7, 21, 49, 107, 147, 321, 749, 1321, 2247, 3963, 5243, 9247, 15729, 27741, 64729, 141347, 194187, 424041, 989429, 2968287, 6926003, 20778009]

約数ペア:

[(1, 20778009), (3, 6926003), (7, 2968287), (21, 989429), (49, 424041), (107, 194187), (147, 141347), (321, 64729), (749, 27741), (1321, 15729), (2247, 9247), (3963, 5243)]