19978719

素因数分解:

$3^1\times {\mathrm{107}}^1\times {\mathrm{109}}^1\times {\mathrm{571}}^1$

素因数の和:790

約数の個数: 16

約数和(自身を含む): 27181440

約数和(自身を除く): 7202721

約数列:

[1, 3, 107, 109, 321, 327, 571, 1713, 11663, 34989, 61097, 62239, 183291, 186717, 6659573, 19978719]

約数ペア:

[(1, 19978719), (3, 6659573), (107, 186717), (109, 183291), (321, 62239), (327, 61097), (571, 34989), (1713, 11663)]