
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
The Yangzhou Jianzhen Half Marathon and Grand Canal Marathon Series (Yangzhou Station) in 2023 started on the morning of April 16th. More than 20,000 participants from around the world took part in this international event. Express $20,000$ in scientific notation as ______.

Present the answer in LaTex format: \boxed{Your answer}
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