22004 has 6 divisors (see below), whose sum is σ = 38514. Its totient is φ = 11000.

The previous prime is 22003. The next prime is 22013. The reversal of 22004 is 40022.

It can be written as a sum of positive squares in only one way, i.e., 21904 + 100 = 148^2 + 10^2 .

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 21982 and 22000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2747 + ... + 2754.

It is an arithmetic number, because the mean of its divisors is an integer number (6419).

2²²⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

22004 is a deficient number, since it is larger than the sum of its proper divisors (16510).

22004 is a wasteful number, since it uses less digits than its factorization.

22004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505 (or 5503 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 22004 is about 148.3374531263. The cubic root of 22004 is about 28.0220914093.

Adding to 22004 its reverse (40022), we get a palindrome (62026).

The spelling of 22004 in words is "twenty-two thousand, four", and thus it is an iban number.