21787129

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{12601}}^1$

素因数の和:12640

約数の個数: 16

約数和(自身を含む): 28228480

約数和(自身を除く): 6441351

約数列:

[1, 7, 13, 19, 91, 133, 247, 1729, 12601, 88207, 163813, 239419, 1146691, 1675933, 3112447, 21787129]

約数ペア:

[(1, 21787129), (7, 3112447), (13, 1675933), (19, 1146691), (91, 239419), (133, 163813), (247, 88207), (1729, 12601)]