20921481

素因数分解:

$3^2\times 7^2\times {\mathrm{47441}}^1$

素因数の和:47461

約数の個数: 18

約数和(自身を含む): 35154522

約数和(自身を除く): 14233041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 47441, 142323, 332087, 426969, 996261, 2324609, 2988783, 6973827, 20921481]

約数ペア:

[(1, 20921481), (3, 6973827), (7, 2988783), (9, 2324609), (21, 996261), (49, 426969), (63, 332087), (147, 142323), (441, 47441)]