21328215

素因数分解:

$3^1\times 5^1\times {\mathrm{43}}^2\times {\mathrm{769}}^1$

素因数の和:863

約数の個数: 24

約数和(自身を含む): 34982640

約数和(自身を除く): 13654425

約数列:

[1, 3, 5, 15, 43, 129, 215, 645, 769, 1849, 2307, 3845, 5547, 9245, 11535, 27735, 33067, 99201, 165335, 496005, 1421881, 4265643, 7109405, 21328215]

約数ペア:

[(1, 21328215), (3, 7109405), (5, 4265643), (15, 1421881), (43, 496005), (129, 165335), (215, 99201), (645, 33067), (769, 27735), (1849, 11535), (2307, 9245), (3845, 5547)]