21123405

素因数分解:

$3^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{107}}^2$

素因数の和:266

約数の個数: 36

約数和(自身を含む): 37860732

約数和(自身を除く): 16737327

約数列:

[1, 3, 5, 9, 15, 41, 45, 107, 123, 205, 321, 369, 535, 615, 963, 1605, 1845, 4387, 4815, 11449, 13161, 21935, 34347, 39483, 57245, 65805, 103041, 171735, 197415, 469409, 515205, 1408227, 2347045, 4224681, 7041135, 21123405]

約数ペア:

[(1, 21123405), (3, 7041135), (5, 4224681), (9, 2347045), (15, 1408227), (41, 515205), (45, 469409), (107, 197415), (123, 171735), (205, 103041), (321, 65805), (369, 57245), (535, 39483), (615, 34347), (963, 21935), (1605, 13161), (1845, 11449), (4387, 4815)]