Cremona's table of elliptic curves

20808 = 2³ · 3² · 17²

Field	Data	Notes
Atkin-Lehner	2+ 3+ 17+	Signs for the Atkin-Lehner involutions
Class	20808d	Isogeny class
Conductor	20808	Conductor
∏ cp	16	Product of Tamagawa factors cp
deg	21504	Modular degree for the optimal curve
Δ	-24755860224 = -1 · 28 · 39 · 173	Discriminant
Eigenvalues	2+ 3+  3 -4 -1 -5 17+  5	Hecke eigenvalues for primes up to 20
Equation	[0,0,0,-1836,-31212]	[a1,a2,a3,a4,a6]
Generators	[102:918:1]	Generators of the group modulo torsion
j	-27648	j-invariant
L	5.3120843230163	L(r)(E,1)/r!
Ω	0.36389808897407	Real period
R	0.91235782832642	Regulator
r	1	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	1	Number of elements in the torsion subgroup
Twists	41616f1 20808y1 20808e1	Quadratic twists by: -4 -3 17

Hecke Eigenvalues for elliptic curve 20808d1

a2	a3	a5	a7	a11	a13	a17	a19	a23	a29	a31	a37	a41	a43	a47	a53	a59	a61	a67	a71	a73	a79	a83	a89	a97
+	+	3	-4	-1	-5	+	5	3	2	0	-8	9	3	4	-12	8	-4	-8	12	4	-16	4	4	4

---

Quadratic twists for elliptic curve 20808d1

-4	-3	17
41616f1	20808y1	20808e1

---

Data from Elliptic Curve Data by J. E. Cremona.
Design inspired by The Modular Forms Explorer by William Stein.

Part of Computational Number Theory
Back to Tables and computations