22004813 has 6 divisors (see below), whose sum is σ = 23003694. Its totient is φ = 21047576.

The previous prime is 22004797. The next prime is 22004819. The reversal of 22004813 is 31840022.

It can be written as a sum of positive squares in only one way, i.e., 17330569 + 4674244 = 4163^2 + 2162^2 .

It is not a de Polignac number, because 22004813 - 2⁴ = 22004797 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 (22004819) 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 5 ways as a sum of consecutive naturals, for example, 20270 + ... + 21327.

It is an arithmetic number, because the mean of its divisors is an integer number (3833949).

Almost surely, 2^22004813 is an apocalyptic number.

22004813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

22004813 is a deficient number, since it is larger than the sum of its proper divisors (998881).

22004813 is an equidigital number, since it uses as much as digits as its factorization.

22004813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41643 (or 41620 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 22004813 is about 4690.9287992891. The cubic root of 22004813 is about 280.2243652352.

Adding to 22004813 its reverse (31840022), we get a palindrome (53844835).

The spelling of 22004813 in words is "twenty-two million, four thousand, eight hundred thirteen".