21407709

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{109}}^1\times {\mathrm{3851}}^1$

素因数の和:3980

約数の個数: 16

約数和(自身を含む): 30507840

約数和(自身を除く): 9100131

約数列:

[1, 3, 17, 51, 109, 327, 1853, 3851, 5559, 11553, 65467, 196401, 419759, 1259277, 7135903, 21407709]

約数ペア:

[(1, 21407709), (3, 7135903), (17, 1259277), (51, 419759), (109, 196401), (327, 65467), (1853, 11553), (3851, 5559)]