22745 has 4 divisors (see below), whose sum is σ = 27300. Its totient is φ = 18192.

The previous prime is 22741. The next prime is 22751. The reversal of 22745 is 54722.

22745 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54722 = 2 ⋅27361.

It can be written as a sum of positive squares in 2 ways, for example, as 12544 + 10201 = 112^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 22745 - 2² = 22741 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (22741) 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, 2270 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (6825).

2²²⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

22745 is a deficient number, since it is larger than the sum of its proper divisors (4555).

22745 is an equidigital number, since it uses as much as digits as its factorization.

22745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554.

The product of its digits is 560, while the sum is 20.

The square root of 22745 is about 150.8144555406. The cubic root of 22745 is about 28.3331795455. Note that the first 3 decimals are identical.

It can be divided in two parts, 227 and 45, that added together give a palindrome (272).

The spelling of 22745 in words is "twenty-two thousand, seven hundred forty-five".