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	2	Number of curves in isogeny class
Curves	20640n1 20640n2	Curves in isogeny class
deg	225792	Modular degree for the optimal curve
Eigenvalues	2- 3+ 5+ -2 -2 -2 -4  2	Hecke eigenvalues for primes less than 20
L	0.19957097511176	L(r)(E,1)/r!
r	0	Rank of the group of rational points
Twists	20640v 41280dq 61920s 103200ba	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for isogeny class 20640n

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
-	+	+	-2	-2	-2	-4	2	-2	-6	-8	10	2	+	6	-6	-6	0	-12	8	-4	-16	0	2	-18

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Quadratic twists for isogeny class 20640n

-4	8	-3	5
20640v	41280dq	61920s	103200ba

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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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