18721899

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{6911}}^1$

素因数の和:6967

約数の個数: 24

約数和(自身を含む): 31629312

約数和(自身を除く): 12907413

約数列:

[1, 3, 7, 9, 21, 43, 63, 129, 301, 387, 903, 2709, 6911, 20733, 48377, 62199, 145131, 297173, 435393, 891519, 2080211, 2674557, 6240633, 18721899]

約数ペア:

[(1, 18721899), (3, 6240633), (7, 2674557), (9, 2080211), (21, 891519), (43, 435393), (63, 297173), (129, 145131), (301, 62199), (387, 48377), (903, 20733), (2709, 6911)]