20858564806 has 32 divisors (see below), whose sum is σ = 33074438400. Its totient is φ = 9846282336.

The previous prime is 20858564791. The next prime is 20858564809. The reversal of 20858564806 is 60846585802.

It is a super-2 number, since 2×20858564806² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858564809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1355745 + ... + 1371043.

It is an arithmetic number, because the mean of its divisors is an integer number (1033576200).

Almost surely, 2^20858564806 is an apocalyptic number.

20858564806 is a deficient number, since it is larger than the sum of its proper divisors (12215873594).

20858564806 is a wasteful number, since it uses less digits than its factorization.

20858564806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15708.

The product of its (nonzero) digits is 3686400, while the sum is 52.

The spelling of 20858564806 in words is "twenty billion, eight hundred fifty-eight million, five hundred sixty-four thousand, eight hundred six".