20685934064 has 20 divisors (see below), whose sum is σ = 40643492400. Its totient is φ = 10197290880.

The previous prime is 20685934037. The next prime is 20685934069. The reversal of 20685934064 is 46043958602.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685934069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9103589 + ... + 9105860.

It is an arithmetic number, because the mean of its divisors is an integer number (2032174620).

Almost surely, 2^20685934064 is an apocalyptic number.

It is an amenable number.

20685934064 is a deficient number, since it is larger than the sum of its proper divisors (19957558336).

20685934064 is a wasteful number, since it uses less digits than its factorization.

20685934064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18209528 (or 18209522 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 20685934064 in words is "twenty billion, six hundred eighty-five million, nine hundred thirty-four thousand, sixty-four".