21148857

素因数分解:

$3^4\times {\mathrm{191}}^1\times {\mathrm{1367}}^1$

素因数の和:1570

約数の個数: 20

約数和(自身を含む): 31781376

約数和(自身を除く): 10632519

約数列:

[1, 3, 9, 27, 81, 191, 573, 1367, 1719, 4101, 5157, 12303, 15471, 36909, 110727, 261097, 783291, 2349873, 7049619, 21148857]

約数ペア:

[(1, 21148857), (3, 7049619), (9, 2349873), (27, 783291), (81, 261097), (191, 110727), (573, 36909), (1367, 15471), (1719, 12303), (4101, 5157)]