20,615,673

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Number

$20 \, 615 \, 673$ is:

$3 \times 13 \times 331 \times 1597$

The $2$nd known positive integer whose fourth power can be expressed as the sum of $3$ fourth powers, thus refuting the Euler Quartic Conjecture:

$20 \, 615 \, 673^4 = 2 \, 682 \, 440^4 + 15 \, 365 \, 639^4 + 18 \, 796 \, 760^4$

Also see

• Previous  ... Next: Counterexamples to Euler Quartic Conjecture

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $20,615,673$