21138481

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{1559}}^1$

素因数の和:1728

約数の個数: 16

約数和(自身を含む): 26208000

約数和(自身を除く): 5069519

約数列:

[1, 7, 13, 91, 149, 1043, 1559, 1937, 10913, 13559, 20267, 141869, 232291, 1626037, 3019783, 21138481]

約数ペア:

[(1, 21138481), (7, 3019783), (13, 1626037), (91, 232291), (149, 141869), (1043, 20267), (1559, 13559), (1937, 10913)]