Guppy

The guppy (also called minnowcrumb) is equal to 1020 = E20 = 100,000,000,000,000,000,000. It is equal to 100 quintillion in the short scale and 100 trillion in the long scale. Aarex Tiaokhiao calls this number twootol. Username5243 calls this number goovol, and it's equal to 10[1]20 in Username5243's Array Notation.

This number is also called Gai (垓 in Chinese, がい in Japanese) in both Japanese counting system and Chinese counting system.