Is there way to convert a 38 digit number into a String of length 18 to 20 without any special character?

I have an Use case where i need to encode 38 digit number into a string of length 18 to 20.

Iam using a ByteBuffer with capacity of 16 bytes in java to store two Long values. Then i try to encode it to a string without any special characters. I tried base32 encoding which resulted in string of length 26, But i need a much smaller string for my use case.

Is there any workarounds for this?

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