21072877

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{2903}}^1$

素因数の和:2988

約数の個数: 16

約数和(自身を含む): 25926912

約数和(自身を除く): 4854035

約数列:

[1, 7, 17, 61, 119, 427, 1037, 2903, 7259, 20321, 49351, 177083, 345457, 1239581, 3010411, 21072877]

約数ペア:

[(1, 21072877), (7, 3010411), (17, 1239581), (61, 345457), (119, 177083), (427, 49351), (1037, 20321), (2903, 7259)]