20564346206 has 4 divisors (see below), whose sum is σ = 30846519312. Its totient is φ = 10282173102.

The previous prime is 20564346203. The next prime is 20564346221. The reversal of 20564346206 is 60264346502.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20564346206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564346203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5141086550 + ... + 5141086553.

It is an arithmetic number, because the mean of its divisors is an integer number (7711629828).

Almost surely, 2^20564346206 is an apocalyptic number.

20564346206 is a deficient number, since it is larger than the sum of its proper divisors (10282173106).

20564346206 is a wasteful number, since it uses less digits than its factorization.

20564346206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10282173105.

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 20564346206 in words is "twenty billion, five hundred sixty-four million, three hundred forty-six thousand, two hundred six".