20981457

素因数分解:

$3^3\times 7^2\times {\mathrm{15859}}^1$

素因数の和:15882

約数の個数: 24

約数和(自身を含む): 36160800

約数和(自身を除く): 15179343

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 1323, 15859, 47577, 111013, 142731, 333039, 428193, 777091, 999117, 2331273, 2997351, 6993819, 20981457]

約数ペア:

[(1, 20981457), (3, 6993819), (7, 2997351), (9, 2331273), (21, 999117), (27, 777091), (49, 428193), (63, 333039), (147, 142731), (189, 111013), (441, 47577), (1323, 15859)]