21391287

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{607}}^1\times {\mathrm{691}}^1$

素因数の和:1318

約数の個数: 16

約数和(自身を含む): 30292992

約数和(自身を除く): 8901705

約数列:

[1, 3, 17, 51, 607, 691, 1821, 2073, 10319, 11747, 30957, 35241, 419437, 1258311, 7130429, 21391287]

約数ペア:

[(1, 21391287), (3, 7130429), (17, 1258311), (51, 419437), (607, 35241), (691, 30957), (1821, 11747), (2073, 10319)]