20405054023 has 4 divisors (see below), whose sum is σ = 20421034200. Its totient is φ = 20389073848.

The previous prime is 20405053969. The next prime is 20405054041. The reversal of 20405054023 is 32045050402.

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

It is a cyclic number.

It is not a de Polignac number, because 20405054023 - 2³³ = 11815119431 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 (20405054053) 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, 7988173 + ... + 7990726.

It is an arithmetic number, because the mean of its divisors is an integer number (5105258550).

Almost surely, 2^20405054023 is an apocalyptic number.

20405054023 is a deficient number, since it is larger than the sum of its proper divisors (15980177).

20405054023 is a wasteful number, since it uses less digits than its factorization.

20405054023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15980176.

The product of its (nonzero) digits is 4800, while the sum is 25.

The spelling of 20405054023 in words is "twenty billion, four hundred five million, fifty-four thousand, twenty-three".