21605241

素因数分解:

$3^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{6553}}^1$

素因数の和:6720

約数の個数: 16

約数和(自身を含む): 33137024

約数和(自身を除く): 11531783

約数列:

[1, 3, 7, 21, 157, 471, 1099, 3297, 6553, 19659, 45871, 137613, 1028821, 3086463, 7201747, 21605241]

約数ペア:

[(1, 21605241), (3, 7201747), (7, 3086463), (21, 1028821), (157, 137613), (471, 45871), (1099, 19659), (3297, 6553)]