20868573077 has 4 divisors (see below), whose sum is σ = 22765716096. Its totient is φ = 18971430060.

The previous prime is 20868573073. The next prime is 20868573083. The reversal of 20868573077 is 77037586802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20868573077 - 2² = 20868573073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868573073) 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, 948571493 + ... + 948571514.

It is an arithmetic number, because the mean of its divisors is an integer number (5691429024).

Almost surely, 2^20868573077 is an apocalyptic number.

It is an amenable number.

20868573077 is a deficient number, since it is larger than the sum of its proper divisors (1897143019).

20868573077 is a wasteful number, since it uses less digits than its factorization.

20868573077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897143018.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 20868573077 in words is "twenty billion, eight hundred sixty-eight million, five hundred seventy-three thousand, seventy-seven".