21198891

素因数分解:

$3^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{27283}}^1$

素因数の和:27330

約数の個数: 16

約数和(自身を含む): 33177344

約数和(自身を除く): 11978453

約数列:

[1, 3, 7, 21, 37, 111, 259, 777, 27283, 81849, 190981, 572943, 1009471, 3028413, 7066297, 21198891]

約数ペア:

[(1, 21198891), (3, 7066297), (7, 3028413), (21, 1009471), (37, 572943), (111, 190981), (259, 81849), (777, 27283)]