20423923 has 8 divisors (see below), whose sum is σ = 22077216. Its totient is φ = 18782400.

The previous prime is 20423911. The next prime is 20423927. The reversal of 20423923 is 32932402.

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

It is not a de Polignac number, because 20423923 - 2⁵ = 20423891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423927) 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, 858 + ... + 6448.

It is an arithmetic number, because the mean of its divisors is an integer number (2759652).

Almost surely, 2^20423923 is an apocalyptic number.

20423923 is a deficient number, since it is larger than the sum of its proper divisors (1653293).

20423923 is a wasteful number, since it uses less digits than its factorization.

20423923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5885.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20423923 is about 4519.2834609040. The cubic root of 20423923 is about 273.3462088257.

The spelling of 20423923 in words is "twenty million, four hundred twenty-three thousand, nine hundred twenty-three".