20324231 has 4 divisors (see below), whose sum is σ = 21519792. Its totient is φ = 19128672.

The previous prime is 20324221. The next prime is 20324237. The reversal of 20324231 is 13242302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13242302 = 2 ⋅6621151.

It is not a de Polignac number, because 20324231 - 2¹⁸ = 20062087 is a prime.

It is a super-2 number, since 2×20324231² = 826148731482722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1195543 = 20324231 / (2 + 0 + 3 + 2 + 4 + 2 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324237) 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, 597755 + ... + 597788.

It is an arithmetic number, because the mean of its divisors is an integer number (5379948).

Almost surely, 2^20324231 is an apocalyptic number.

20324231 is a deficient number, since it is larger than the sum of its proper divisors (1195561).

20324231 is a wasteful number, since it uses less digits than its factorization.

20324231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195560.

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

The square root of 20324231 is about 4508.2403440810. The cubic root of 20324231 is about 272.9007363180.

Adding to 20324231 its reverse (13242302), we get a palindrome (33566533).

The spelling of 20324231 in words is "twenty million, three hundred twenty-four thousand, two hundred thirty-one".