20564369138 has 16 divisors (see below), whose sum is σ = 32234884416. Its totient is φ = 9820718160.

The previous prime is 20564369131. The next prime is 20564369153. The reversal of 20564369138 is 83196346502.

It is a junction number, because it is equal to n+sod(n) for n = 20564369092 and 20564369101.

It is not an unprimeable number, because it can be changed into a prime (20564369131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295853 + ... + 358688.

It is an arithmetic number, because the mean of its divisors is an integer number (2014680276).

Almost surely, 2^20564369138 is an apocalyptic number.

20564369138 is a deficient number, since it is larger than the sum of its proper divisors (11670515278).

20564369138 is a wasteful number, since it uses less digits than its factorization.

20564369138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655249.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 20564369138 in words is "twenty billion, five hundred sixty-four million, three hundred sixty-nine thousand, one hundred thirty-eight".