22005623 has 4 divisors (see below), whose sum is σ = 22067280. Its totient is φ = 21943968.

The previous prime is 22005617. The next prime is 22005647. The reversal of 22005623 is 32650022.

It is a happy number.

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 22005623 - 2⁶ = 22005559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22005595 and 22005604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22005673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30290 + ... + 31007.

It is an arithmetic number, because the mean of its divisors is an integer number (5516820).

Almost surely, 2^22005623 is an apocalyptic number.

22005623 is a deficient number, since it is larger than the sum of its proper divisors (61657).

22005623 is an equidigital number, since it uses as much as digits as its factorization.

22005623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61656.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 22005623 is about 4691.0151353412. The cubic root of 22005623 is about 280.2278035580.

Adding to 22005623 its reverse (32650022), we get a palindrome (54655645).

The spelling of 22005623 in words is "twenty-two million, five thousand, six hundred twenty-three".