20340231 has 4 divisors (see below), whose sum is σ = 27120312. Its totient is φ = 13560152.

The previous prime is 20340197. The next prime is 20340233. The reversal of 20340231 is 13204302.

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

It is a cyclic number.

It is not a de Polignac number, because 20340231 - 2⁶ = 20340167 is a prime.

It is a super-2 number, since 2×20340231² = 827449994266722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20340231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3390036 + ... + 3390041.

It is an arithmetic number, because the mean of its divisors is an integer number (6780078).

Almost surely, 2^20340231 is an apocalyptic number.

20340231 is a deficient number, since it is larger than the sum of its proper divisors (6780081).

20340231 is an equidigital number, since it uses as much as digits as its factorization.

20340231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780080.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20340231 is about 4510.0145232582. The cubic root of 20340231 is about 272.9723301130.

Adding to 20340231 its reverse (13204302), we get a palindrome (33544533).

The spelling of 20340231 in words is "twenty million, three hundred forty thousand, two hundred thirty-one".