20813023 has 8 divisors (see below), whose sum is σ = 25948800. Its totient is φ = 16217880.

The previous prime is 20813021. The next prime is 20813033. The reversal of 20813023 is 32031802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20813023 - 2¹ = 20813021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135073 + ... + 135226.

It is an arithmetic number, because the mean of its divisors is an integer number (3243600).

Almost surely, 2^20813023 is an apocalyptic number.

20813023 is a deficient number, since it is larger than the sum of its proper divisors (5135777).

20813023 is a wasteful number, since it uses less digits than its factorization.

20813023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270317.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20813023 is about 4562.1292178105. The cubic root of 20813023 is about 275.0711573437.

Adding to 20813023 its reverse (32031802), we get a palindrome (52844825).

It can be divided in two parts, 208 and 13023, that added together give a palindrome (13231).

The spelling of 20813023 in words is "twenty million, eight hundred thirteen thousand, twenty-three".