20985861

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{127}}^1\times {\mathrm{223}}^1$

素因数の和:385

約数の個数: 32

約数和(自身を含む): 32112640

約数和(自身を除く): 11126779

約数列:

[1, 3, 13, 19, 39, 57, 127, 223, 247, 381, 669, 741, 1651, 2413, 2899, 4237, 4953, 7239, 8697, 12711, 28321, 31369, 55081, 84963, 94107, 165243, 368173, 538099, 1104519, 1614297, 6995287, 20985861]

約数ペア:

[(1, 20985861), (3, 6995287), (13, 1614297), (19, 1104519), (39, 538099), (57, 368173), (127, 165243), (223, 94107), (247, 84963), (381, 55081), (669, 31369), (741, 28321), (1651, 12711), (2413, 8697), (2899, 7239), (4237, 4953)]