20917971

素因数分解:

$3^2\times {\mathrm{23}}^1\times {\mathrm{139}}^1\times {\mathrm{727}}^1$

素因数の和:895

約数の個数: 24

約数和(自身を含む): 31799040

約数和(自身を除く): 10881069

約数列:

[1, 3, 9, 23, 69, 139, 207, 417, 727, 1251, 2181, 3197, 6543, 9591, 16721, 28773, 50163, 101053, 150489, 303159, 909477, 2324219, 6972657, 20917971]

約数ペア:

[(1, 20917971), (3, 6972657), (9, 2324219), (23, 909477), (69, 303159), (139, 150489), (207, 101053), (417, 50163), (727, 28773), (1251, 16721), (2181, 9591), (3197, 6543)]