21388905

素因数分解:

$3^2\times 5^1\times {\mathrm{421}}^1\times {\mathrm{1129}}^1$

素因数の和:1561

約数の個数: 24

約数和(自身を含む): 37195080

約数和(自身を除く): 15806175

約数列:

[1, 3, 5, 9, 15, 45, 421, 1129, 1263, 2105, 3387, 3789, 5645, 6315, 10161, 16935, 18945, 50805, 475309, 1425927, 2376545, 4277781, 7129635, 21388905]

約数ペア:

[(1, 21388905), (3, 7129635), (5, 4277781), (9, 2376545), (15, 1425927), (45, 475309), (421, 50805), (1129, 18945), (1263, 16935), (2105, 10161), (3387, 6315), (3789, 5645)]