21285765

素因数分解:

$3^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{83}}^1\times {\mathrm{139}}^1$

素因数の和:274

約数の個数: 48

約数和(自身を含む): 38525760

約数和(自身を除く): 17239995

約数列:

[1, 3, 5, 9, 15, 41, 45, 83, 123, 139, 205, 249, 369, 415, 417, 615, 695, 747, 1245, 1251, 1845, 2085, 3403, 3735, 5699, 6255, 10209, 11537, 17015, 17097, 28495, 30627, 34611, 51045, 51291, 57685, 85485, 103833, 153135, 173055, 256455, 473017, 519165, 1419051, 2365085, 4257153, 7095255, 21285765]

約数ペア:

[(1, 21285765), (3, 7095255), (5, 4257153), (9, 2365085), (15, 1419051), (41, 519165), (45, 473017), (83, 256455), (123, 173055), (139, 153135), (205, 103833), (249, 85485), (369, 57685), (415, 51291), (417, 51045), (615, 34611), (695, 30627), (747, 28495), (1245, 17097), (1251, 17015), (1845, 11537), (2085, 10209), (3403, 6255), (3735, 5699)]