20023439 has 4 divisors (see below), whose sum is σ = 20043240. Its totient is φ = 20003640.

The previous prime is 20023429. The next prime is 20023441. The reversal of 20023439 is 93432002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93432002 = 2 ⋅46716001.

It is a cyclic number.

It is not a de Polignac number, because 20023439 - 2²⁴ = 3246223 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 (20023429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8297 + ... + 10434.

It is an arithmetic number, because the mean of its divisors is an integer number (5010810).

Almost surely, 2^20023439 is an apocalyptic number.

20023439 is a deficient number, since it is larger than the sum of its proper divisors (19801).

20023439 is a wasteful number, since it uses less digits than its factorization.

20023439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19800.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20023439 is about 4474.7557475241. The cubic root of 20023439 is about 271.5477589866.

The spelling of 20023439 in words is "twenty million, twenty-three thousand, four hundred thirty-nine".