<Li> Mathematics--History: 10, largest named number in Archimedes' Sand Reckoner . </Li> <Li> Mathematics: 10 (10 10 100 (\ displaystyle 10 ^ (10 ^ (100)))), a googolplex . A number 1 followed by 1 googol zeros . Carl Sagan has estimated that 1 googolplex, fully written out, would not fit in the observable universe because of its size, while also noting that one could also write the number as 10 . </Li> <P> (One googolplex; 10; short scale: googolplex; long scale: googolplex) </P> <Ul> <Li> Cosmology: The highest estimated time for the Big Freeze to occur is about in 2x10 years . </Li> <Li> Mathematics--Literature: The number of different ways in which the books in Jorge Luis Borges' Library of Babel can be arranged is 10 10 1, 834, 102 (\ displaystyle 10 ^ (10 ^ (1,834,102))), the factorial of the number of books in the Library of Babel . </Li> <Li> Cosmology: In chaotic inflation theory, proposed by physicist Andrei Linde, our universe is one of many other universes with different physical constants that originated as part of our local section of the multiverse, owing to a vacuum that had not decayed to its ground state . According to Linde and Vanchurin, the total number of these universes is about 10 10 10, 000, 000 (\ displaystyle 10 ^ (10 ^ (10,000,000))). </Li> <Li> Mathematics: 10 10 10 34 (\ displaystyle 10 ^ (\, \! 10 ^ (10 ^ (34)))), order of magnitude of an upper bound that occurred in a proof of Skewes (this was later estimated to be closer to 1.397 × 10). </Li> <Li> Cosmology: The estimated number of years for quantum fluctuations and tunnelling to generate a new Big Bang is estimated to be 10 10 10 56 (\ displaystyle 10 ^ (10 ^ (10 ^ (56)))). </Li> <Li> Mathematics: 10 10 10 100 (\ displaystyle 10 ^ (\, \! 10 ^ (10 ^ (100)))), a number in the googol family called a googolplexplex, googolplexian, or googolduplex. 1 followed by a googolplex zeros, or 10 </Li> <Li> Mathematics: 10 10 10 963 (\ displaystyle 10 ^ (\, \! 10 ^ (10 ^ (963)))), order of magnitude of another upper bound in a proof of Skewes . </Li> <Li> Mathematics: Moser's number "2 in a mega-gon" is approximately equal to 10 ↑ ↑ ↑...↑ ↑ ↑ 10, where there are 10 ↑ ↑ 257 arrows, the last four digits are...1056 . </Li> <Li> Mathematics: Graham's number, the last ten digits of which are...24641 95387 . Arises as an upper bound solution to a problem in Ramsey theory . Representation in powers of 10 would be impractical (the number of 10's in the power tower 10 10 10...(\ displaystyle 10 ^ (\, \! 10 ^ (10 ^ (...)))) would far exceed the number of particles in the observable universe). </Li> <Li> Mathematics: TREE (3): appears in relation to a theorem on trees in graph theory . Representation of the number is difficult, but one weak lower bound is A (1), where A (n) is a version of the Ackermann function . </Li> <Li> Mathematics: SSCG (3): appears in relation to the Robertson--Seymour theorem . Known to be greater than both TREE (3) and TREE (TREE (... TREE (3)...)) (the TREE function nested TREE (3) times with TREE (3) at the bottom). </Li> </Ul>

How do you write 20 million in numbers