19801243

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{2161}}^1$

素因数の和:2203

約数の個数: 24

約数和(自身を含む): 26618544

約数和(自身を除く): 6817301

約数列:

[1, 7, 11, 17, 49, 77, 119, 187, 539, 833, 1309, 2161, 9163, 15127, 23771, 36737, 105889, 166397, 257159, 404107, 1164779, 1800113, 2828749, 19801243]

約数ペア:

[(1, 19801243), (7, 2828749), (11, 1800113), (17, 1164779), (49, 404107), (77, 257159), (119, 166397), (187, 105889), (539, 36737), (833, 23771), (1309, 15127), (2161, 9163)]