21720517

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{6451}}^1$

素因数の和:6508

約数の個数: 16

約数和(自身を含む): 27459712

約数和(自身を除く): 5739195

約数列:

[1, 7, 13, 37, 91, 259, 481, 3367, 6451, 45157, 83863, 238687, 587041, 1670809, 3102931, 21720517]

約数ペア:

[(1, 21720517), (7, 3102931), (13, 1670809), (37, 587041), (91, 238687), (259, 83863), (481, 45157), (3367, 6451)]