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MATH / 20! has 19 digits, the last 18 of which are 432902008176640000. What is the first digit?

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problem

20!20! has 19 digits, the last 18 of which are 432902008176640000. What is the first digit?
Plain-text mathematical notation (without MathML)
20! has 19 digits, the last 18 of which are 432902008176640000. What is the first digit?
Original LaTeX notation
$20!$ has 19 digits, the last 18 of which are 432902008176640000. What is the first digit?

level

Level 3

type

Number Theory

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