20905885

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{4177}}^1$

素因数の和:4213

約数の個数: 32

約数和(自身を含む): 33691392

約数和(自身を除く): 12785507

約数列:

[1, 5, 7, 11, 13, 35, 55, 65, 77, 91, 143, 385, 455, 715, 1001, 4177, 5005, 20885, 29239, 45947, 54301, 146195, 229735, 271505, 321629, 380107, 597311, 1608145, 1900535, 2986555, 4181177, 20905885]

約数ペア:

[(1, 20905885), (5, 4181177), (7, 2986555), (11, 1900535), (13, 1608145), (35, 597311), (55, 380107), (65, 321629), (77, 271505), (91, 229735), (143, 146195), (385, 54301), (455, 45947), (715, 29239), (1001, 20885), (4177, 5005)]