20673399923 has 8 divisors (see below), whose sum is σ = 22606374576. Its totient is φ = 18749354400.

The previous prime is 20673399917. The next prime is 20673399941. The reversal of 20673399923 is 32999337602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20673399923 - 2²⁰ = 20672351347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20673399983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2227436 + ... + 2236697.

It is an arithmetic number, because the mean of its divisors is an integer number (2825796822).

Almost surely, 2^20673399923 is an apocalyptic number.

20673399923 is a deficient number, since it is larger than the sum of its proper divisors (1932974653).

20673399923 is a wasteful number, since it uses less digits than its factorization.

20673399923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464565.

The product of its (nonzero) digits is 3306744, while the sum is 53.

The spelling of 20673399923 in words is "twenty billion, six hundred seventy-three million, three hundred ninety-nine thousand, nine hundred twenty-three".