21307905

素因数分解:

$3^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{11549}}^1$

素因数の和:11601

約数の個数: 24

約数和(自身を含む): 37837800

約数和(自身を除く): 16529895

約数列:

[1, 3, 5, 9, 15, 41, 45, 123, 205, 369, 615, 1845, 11549, 34647, 57745, 103941, 173235, 473509, 519705, 1420527, 2367545, 4261581, 7102635, 21307905]

約数ペア:

[(1, 21307905), (3, 7102635), (5, 4261581), (9, 2367545), (15, 1420527), (41, 519705), (45, 473509), (123, 173235), (205, 103941), (369, 57745), (615, 34647), (1845, 11549)]