20243231 has 4 divisors (see below), whose sum is σ = 20253600. Its totient is φ = 20232864.

The previous prime is 20243219. The next prime is 20243233. The reversal of 20243231 is 13234202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20243231 - 2¹⁴ = 20226847 is a prime.

It is a super-2 number, since 2×20243231² = 819576802638722, 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 (20243233) 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, 1271 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (5063400).

Almost surely, 2^20243231 is an apocalyptic number.

20243231 is a deficient number, since it is larger than the sum of its proper divisors (10369).

20243231 is an equidigital number, since it uses as much as digits as its factorization.

20243231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10368.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20243231 is about 4499.2478260260. The cubic root of 20243231 is about 272.5377149493.

Adding to 20243231 its reverse (13234202), we get a palindrome (33477433).

The spelling of 20243231 in words is "twenty million, two hundred forty-three thousand, two hundred thirty-one".