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Guppy (also called minnowcrumb) is equal to 1020 = E20 = 100,000,000,000,000,000,000.[1] It is equal to 100 quintillion in the short scale and 100 trillion in the long scale. The name was coined by Sbiis Saibian. It is 21 digits long.

Aarex Tiaokhiao calls this number twootol or 20-noogol.[2]

Username5243 calls this number goovol, and it's equal to 10[1]20 in Username5243's Array Notation.[3]

This number is also called Gai (垓 in Chinese , がい in Japanese)[4] in both Japanese counting system and Chinese counting system.

## Examples

• A guppy gallons of water in a sphere would be 897 kilometers wide, 1/14 of the diameter of Earth.
• A guppy gallons represents approximately 30% of all the water on the Earth.
• A guppy seconds is 3.16 trillion years, about 229 times longer than the age of the universe.
• A guppy square centimeters represents about 2/3 of the cross section of Jupiter.[5]

## As a banknote denomination

Only the Hungarian pengő had banknotes with this number in the denomination; in fact, it was the highest banknote denomination ever issued.

## Approximations in other notations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{20}$$
Arrow notation $$10\uparrow20$$
Steinhaus-Moser Notation 16[3] 17[3]
Copy notation 9[20] 1[21]
Taro's multivariable Ackermann function A(3,63) A(3,64)
Pound-Star Notation #*(5,0,2,4)*4 #*(11)*18
BEAF {10,20}
Bashicu matrix system (0)(0)[100000]
Hyperfactorial array notation 21! 22!
Fast-growing hierarchy $$f_2(60)$$ $$f_2(61)$$
Hardy hierarchy $$H_{\omega^2}(60)$$ $$H_{\omega^2}(61)$$
Slow-growing hierarchy $$g_{\omega^{\omega2}}(10)$$

## Sources

-minutia group
n-ary numbers with multipliers
Eyelash mite group: eyelash mite-speck · eyelash mite-crumb · eyelash mite-chunk · (binary/ternary/octal)eyelash mite · eyelash mite-bunch · eyelash mite-crowd · eyelash mite-swarm
Dust mite group: dust mite-speck · dust mite-crumb · dust mite-chunk · (binary/ternary/octal)dust mite · dust mite-bunch · dust mite-crowd · dust mite-swarm
Cheese mite group: cheese mite-speck · cheese mite-crumb · cheese mite-chunk · (binary/ternary/octal)cheese mite · cheese mite-bunch · cheese mite-crowd · cheese mite-swarm
Clover mite group: clover mite-speck · clover mite-crumb · clover mite-chunk · (binary/ternary/octal)clover mite · clover mite-bunch · clover mite-crowd · clover mite-swarm
Pipsqueak group: (binary/ternary/octal)pipsqueak
Little squeaker group: (binary/ternary/octal)little squeaker
Small fry group: (binary/ternary/octal)small fry
Guppy group: (binary/ternary/octal)guppyspeck · (binary/ternary/octal)guppycrumb · (binary/ternary/octal)guppychunk · (ternary/quaternary/quinary/duodecimal/hexadecimal/vigesimal/sexagesimal)guppy(bit/byte)
Minnow group: (binary/ternary/octal)minnowspeck · (binary/ternary/octal)minnowcrumb · (binary/ternary/octal)minnowchunk · (ternary)minnow(bit/byte)
Goby group: (binary/ternary/octal)gobyspeck · (binary/ternary/octal)gobycrumb · (binary/ternary/octal)gobychunk · (ternary)goby(bit/byte)