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	20640s	Isogeny class
Conductor	20640	Conductor
∏ cp	32	Product of Tamagawa factors cp
Δ	-5671380602880 = -1 · 212 · 34 · 5 · 434	Discriminant
Eigenvalues	2- 3+ 5-  0 -4 -6  2  0	Hecke eigenvalues for primes up to 20
Equation	[0,-1,0,-305,-114495]	[a1,a2,a3,a4,a6]
j	-768575296/1384614405	j-invariant
L	0.6877168340471	L(r)(E,1)/r!
Ω	0.34385841702355	Real period
R	1	Regulator
r	0	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	4	Number of elements in the torsion subgroup
Twists	20640j4 41280z1 61920o2 103200q2	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for elliptic curve 20640s4

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 20640s4

-4	8	-3	5
20640j4	41280z1	61920o2	103200q2

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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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