21701855

素因数分解:

$5^1\times 7^2\times {\mathrm{283}}^1\times {\mathrm{313}}^1$

素因数の和:615

約数の個数: 24

約数和(自身を含む): 30498192

約数和(自身を除く): 8796337

約数列:

[1, 5, 7, 35, 49, 245, 283, 313, 1415, 1565, 1981, 2191, 9905, 10955, 13867, 15337, 69335, 76685, 88579, 442895, 620053, 3100265, 4340371, 21701855]

約数ペア:

[(1, 21701855), (5, 4340371), (7, 3100265), (35, 620053), (49, 442895), (245, 88579), (283, 76685), (313, 69335), (1415, 15337), (1565, 13867), (1981, 10955), (2191, 9905)]