20540688338 has 16 divisors (see below), whose sum is σ = 32445610560. Its totient is φ = 9733678416.

The previous prime is 20540688271. The next prime is 20540688347. The reversal of 20540688338 is 83388604502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20540688292 and 20540688301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2043320 + ... + 2053347.

It is an arithmetic number, because the mean of its divisors is an integer number (2027850660).

Almost surely, 2^20540688338 is an apocalyptic number.

20540688338 is a deficient number, since it is larger than the sum of its proper divisors (11904922222).

20540688338 is a wasteful number, since it uses less digits than its factorization.

20540688338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096801.

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 20540688338 in words is "twenty billion, five hundred forty million, six hundred eighty-eight thousand, three hundred thirty-eight".