21856289

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{12641}}^1$

素因数の和:12680

約数の個数: 16

約数和(自身を含む): 28318080

約数和(自身を除く): 6461791

約数列:

[1, 7, 13, 19, 91, 133, 247, 1729, 12641, 88487, 164333, 240179, 1150331, 1681253, 3122327, 21856289]

約数ペア:

[(1, 21856289), (7, 3122327), (13, 1681253), (19, 1150331), (91, 240179), (133, 164333), (247, 88487), (1729, 12641)]