20023231 has 4 divisors (see below), whose sum is σ = 20210472. Its totient is φ = 19835992.

The previous prime is 20023187. The next prime is 20023259. The reversal of 20023231 is 13232002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023231 is a prime.

It is a super-2 number, since 2×20023231² = 801859559358722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023291) 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, 93460 + ... + 93673.

It is an arithmetic number, because the mean of its divisors is an integer number (5052618).

Almost surely, 2^20023231 is an apocalyptic number.

20023231 is a deficient number, since it is larger than the sum of its proper divisors (187241).

20023231 is a wasteful number, since it uses less digits than its factorization.

20023231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187240.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20023231 is about 4474.7325059717. The cubic root of 20023231 is about 271.5468187197.

Adding to 20023231 its reverse (13232002), we get a palindrome (33255233).

The spelling of 20023231 in words is "twenty million, twenty-three thousand, two hundred thirty-one".