20578706858 has 4 divisors (see below), whose sum is σ = 30868060290. Its totient is φ = 10289353428.

The previous prime is 20578706857. The next prime is 20578706887. The reversal of 20578706858 is 85860787502.

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

It can be written as a sum of positive squares in only one way, i.e., 20133623449 + 445083409 = 141893^2 + 21097^2 .

It is not an unprimeable number, because it can be changed into a prime (20578706857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5144676713 + ... + 5144676716.

Almost surely, 2^20578706858 is an apocalyptic number.

20578706858 is a deficient number, since it is larger than the sum of its proper divisors (10289353432).

20578706858 is a wasteful number, since it uses less digits than its factorization.

20578706858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10289353431.

The product of its (nonzero) digits is 7526400, while the sum is 56.

The spelling of 20578706858 in words is "twenty billion, five hundred seventy-eight million, seven hundred six thousand, eight hundred fifty-eight".