21215453

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{313}}^1\times {\mathrm{421}}^1$

素因数の和:764

約数の個数: 16

約数和(自身を含む): 25441536

約数和(自身を除く): 4226083

約数列:

[1, 7, 23, 161, 313, 421, 2191, 2947, 7199, 9683, 50393, 67781, 131773, 922411, 3030779, 21215453]

約数ペア:

[(1, 21215453), (7, 3030779), (23, 922411), (161, 131773), (313, 67781), (421, 50393), (2191, 9683), (2947, 7199)]