21420651

素因数分解:

$3^1\times 7^1\times {\mathrm{107}}^1\times {\mathrm{9533}}^1$

素因数の和:9650

約数の個数: 16

約数和(自身を含む): 32949504

約数和(自身を除く): 11528853

約数列:

[1, 3, 7, 21, 107, 321, 749, 2247, 9533, 28599, 66731, 200193, 1020031, 3060093, 7140217, 21420651]

約数ペア:

[(1, 21420651), (3, 7140217), (7, 3060093), (21, 1020031), (107, 200193), (321, 66731), (749, 28599), (2247, 9533)]