20442231 has 12 divisors (see below), whose sum is σ = 30248400. Its totient is φ = 13295520.

The previous prime is 20442203. The next prime is 20442269. The reversal of 20442231 is 13224402.

It is not a de Polignac number, because 20442231 - 2¹⁸ = 20180087 is a prime.

It is a super-2 number, since 2×20442231² = 835769616514722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27331 + ... + 28068.

It is an arithmetic number, because the mean of its divisors is an integer number (2520700).

Almost surely, 2^20442231 is an apocalyptic number.

20442231 is a deficient number, since it is larger than the sum of its proper divisors (9806169).

20442231 is a wasteful number, since it uses less digits than its factorization.

20442231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55446 (or 55443 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20442231 is about 4521.3085495241. The cubic root of 20442231 is about 273.4278602599.

Adding to 20442231 its reverse (13224402), we get a palindrome (33666633).

The spelling of 20442231 in words is "twenty million, four hundred forty-two thousand, two hundred thirty-one".