20809467

素因数分解:

$3^4\times 7^4\times {\mathrm{107}}^1$

素因数の和:147

約数の個数: 50

約数和(自身を含む): 36603468

約数和(自身を除く): 15794001

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 107, 147, 189, 321, 343, 441, 567, 749, 963, 1029, 1323, 2247, 2401, 2889, 3087, 3969, 5243, 6741, 7203, 8667, 9261, 15729, 20223, 21609, 27783, 36701, 47187, 60669, 64827, 110103, 141561, 194481, 256907, 330309, 424683, 770721, 990927, 2312163, 2972781, 6936489, 20809467]

約数ペア:

[(1, 20809467), (3, 6936489), (7, 2972781), (9, 2312163), (21, 990927), (27, 770721), (49, 424683), (63, 330309), (81, 256907), (107, 194481), (147, 141561), (189, 110103), (321, 64827), (343, 60669), (441, 47187), (567, 36701), (749, 27783), (963, 21609), (1029, 20223), (1323, 15729), (2247, 9261), (2401, 8667), (2889, 7203), (3087, 6741), (3969, 5243)]