20340823 has 4 divisors (see below), whose sum is σ = 21537360. Its totient is φ = 19144288.

The previous prime is 20340799. The next prime is 20340829. The reversal of 20340823 is 32804302.

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 20340823 - 2⁹ = 20340311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20340794 and 20340803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340829) 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, 598243 + ... + 598276.

It is an arithmetic number, because the mean of its divisors is an integer number (5384340).

Almost surely, 2^20340823 is an apocalyptic number.

20340823 is a deficient number, since it is larger than the sum of its proper divisors (1196537).

20340823 is a wasteful number, since it uses less digits than its factorization.

20340823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196536.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20340823 is about 4510.0801544984. The cubic root of 20340823 is about 272.9749783630.

The spelling of 20340823 in words is "twenty million, three hundred forty thousand, eight hundred twenty-three".