21152920

素因数分解:

$2^3\times 5^1\times {\mathrm{528823}}^1$

素因数の和:528834

約数の個数: 16

約数和(自身を含む): 47594160

約数和(自身を除く): 26441240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 528823, 1057646, 2115292, 2644115, 4230584, 5288230, 10576460, 21152920]

約数ペア:

[(1, 21152920), (2, 10576460), (4, 5288230), (5, 4230584), (8, 2644115), (10, 2115292), (20, 1057646), (40, 528823)]