21137767

素因数分解:

$7^2\times {\mathrm{37}}^1\times {\mathrm{89}}^1\times {\mathrm{131}}^1$

素因数の和:271

約数の個数: 24

約数和(自身を含む): 25732080

約数和(自身を除く): 4594313

約数列:

[1, 7, 37, 49, 89, 131, 259, 623, 917, 1813, 3293, 4361, 4847, 6419, 11659, 23051, 33929, 81613, 161357, 237503, 431383, 571291, 3019681, 21137767]

約数ペア:

[(1, 21137767), (7, 3019681), (37, 571291), (49, 431383), (89, 237503), (131, 161357), (259, 81613), (623, 33929), (917, 23051), (1813, 11659), (3293, 6419), (4361, 4847)]