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
Class	20640j	Isogeny class
Conductor	20640	Conductor
∏ cp	16	Product of Tamagawa factors cp
Δ	4738583047680 = 29 · 316 · 5 · 43	Discriminant
Eigenvalues	2+ 3- 5-  0  4 -6  2  0	Hecke eigenvalues for primes up to 20
Equation	[0,1,0,-4480,-50020]	[a1,a2,a3,a4,a6]
Generators	[83:396:1]	Generators of the group modulo torsion
j	19426060200968/9255045015	j-invariant
L	6.9361395662532	L(r)(E,1)/r!
Ω	0.61159539306209	Real period
R	2.8352648028977	Regulator
r	1	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	2	Number of elements in the torsion subgroup
Twists	20640s3 41280j3 61920bp3 103200bs3	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for elliptic curve 20640j2

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	-6	2	0	0	-2	4	-10	-6	+	0	-6	4	-2	-12	-16	14	4	4	2	10

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Quadratic twists for elliptic curve 20640j2

-4	8	-3	5
20640s3	41280j3	61920bp3	103200bs3

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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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