22005813 has 8 divisors (see below), whose sum is σ = 29363328. Its totient is φ = 14659424.

The previous prime is 22005791. The next prime is 22005817. The reversal of 22005813 is 31850022.

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

It is a cyclic number.

It is not a de Polignac number, because 22005813 - 2⁶ = 22005749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22005813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22005817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4756 + ... + 8162.

It is an arithmetic number, because the mean of its divisors is an integer number (3670416).

Almost surely, 2^22005813 is an apocalyptic number.

It is an amenable number.

22005813 is a deficient number, since it is larger than the sum of its proper divisors (7357515).

22005813 is a wasteful number, since it uses less digits than its factorization.

22005813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 22005813 is about 4691.0353867776. The cubic root of 22005813 is about 280.2286100659.

Adding to 22005813 its reverse (31850022), we get a palindrome (53855835).

The spelling of 22005813 in words is "twenty-two million, five thousand, eight hundred thirteen".