21278997

素因数分解:

$3^3\times {\mathrm{331}}^1\times {\mathrm{2381}}^1$

素因数の和:2721

約数の個数: 16

約数和(自身を含む): 31632960

約数和(自身を除く): 10353963

約数列:

[1, 3, 9, 27, 331, 993, 2381, 2979, 7143, 8937, 21429, 64287, 788111, 2364333, 7092999, 21278997]

約数ペア:

[(1, 21278997), (3, 7092999), (9, 2364333), (27, 788111), (331, 64287), (993, 21429), (2381, 8937), (2979, 7143)]