21247681

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{12289}}^1$

素因数の和:12328

約数の個数: 16

約数和(自身を含む): 27529600

約数和(自身を除く): 6281919

約数列:

[1, 7, 13, 19, 91, 133, 247, 1729, 12289, 86023, 159757, 233491, 1118299, 1634437, 3035383, 21247681]

約数ペア:

[(1, 21247681), (7, 3035383), (13, 1634437), (19, 1118299), (91, 233491), (133, 159757), (247, 86023), (1729, 12289)]