There's no specific word that means "the number with the most zeroes" (out of a specific set), and there's no "number with the most zeroes" in general.
The maximum number of zeros in a number is determined by the number of factors of 10 in that number. Each factor of 10 is made up of 2 factors of 5 and 2 factors of 2. Therefore, the maximum number of zeros in a number is equal to the minimum of the number of factors of 5 and the number of factors of 2. For example, in the number 1000, there are three factors of 10, so the maximum number of zeros is 3.
it is in the millions
sextillion
Trillion
octillion
nonevsextillionocteillion
2*1020 this is called 200quintillion a quintillion is a number with 18 zeros a sextillion is a number with 21 zeros your number has 20 zeros therefore it is not quite a sextillion yet.
ten's of billions
One billion
The number that has 15 zeroes is called quadrillion.
The number with 18 zeros is called a quintillion in the short scale, which is written as 1 followed by 18 zeros: 1,000,000,000,000,000,000. In scientific notation, it can be expressed as (10^{18}).