21090909

素因数分解:

$3^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{6397}}^1$

素因数の和:6564

約数の個数: 16

約数和(自身を含む): 32348288

約数和(自身を除く): 11257379

約数列:

[1, 3, 7, 21, 157, 471, 1099, 3297, 6397, 19191, 44779, 134337, 1004329, 3012987, 7030303, 21090909]

約数ペア:

[(1, 21090909), (3, 7030303), (7, 3012987), (21, 1004329), (157, 134337), (471, 44779), (1099, 19191), (3297, 6397)]