Cremona's table of elliptic curves

20640 = 2⁵ · 3 · 5 · 43

Field	Data	Notes
Atkin-Lehner	2- 3- 5+ 43+	Signs for the Atkin-Lehner involutions
Conductor	20640	Conductor
Count	4	Number of curves in isogeny class
Curves	20640t1 20640t2 20640t3 20640t4	Curves in isogeny class
deg	10240	Modular degree for the optimal curve
Eigenvalues	2- 3- 5+  0 -4 -2  2  4	Hecke eigenvalues for primes less than 20
L	5.5506992353858	L(r)(E,1)/r!
r	1	Rank of the group of rational points
Twists	20640a 41280s 61920q 103200f	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for isogeny class 20640t

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
-	-	+	0	-4	-2	2	4	4	-6	4	2	-6	+	-4	6	4	10	-12	0	-14	-4	12	18	2

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Quadratic twists for isogeny class 20640t

-4	8	-3	5
20640a	41280s	61920q	103200f

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

Part of Computational Number Theory
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