20775023 has 4 divisors (see below), whose sum is σ = 20803728. Its totient is φ = 20746320.

The previous prime is 20775011. The next prime is 20775031. The reversal of 20775023 is 32057702.

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 20775023 - 2⁶ = 20774959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20774983 and 20775001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775043) 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, 13238 + ... + 14723.

It is an arithmetic number, because the mean of its divisors is an integer number (5200932).

Almost surely, 2^20775023 is an apocalyptic number.

20775023 is a deficient number, since it is larger than the sum of its proper divisors (28705).

20775023 is an equidigital number, since it uses as much as digits as its factorization.

20775023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28704.

The product of its (nonzero) digits is 2940, while the sum is 26.

The square root of 20775023 is about 4557.9625930892. The cubic root of 20775023 is about 274.9036488903.

The spelling of 20775023 in words is "twenty million, seven hundred seventy-five thousand, twenty-three".