21197405

素因数分解:

$5^1\times {\mathrm{29}}^2\times {\mathrm{71}}^2$

素因数の和:205

約数の個数: 18

約数和(自身を含む): 26720538

約数和(自身を除く): 5523133

約数列:

[1, 5, 29, 71, 145, 355, 841, 2059, 4205, 5041, 10295, 25205, 59711, 146189, 298555, 730945, 4239481, 21197405]

約数ペア:

[(1, 21197405), (5, 4239481), (29, 730945), (71, 298555), (145, 146189), (355, 59711), (841, 25205), (2059, 10295), (4205, 5041)]