22005556 has 6 divisors (see below), whose sum is σ = 38509730. Its totient is φ = 11002776.

The previous prime is 22005539. The next prime is 22005559. The reversal of 22005556 is 65550022.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 10890000 = 3334^2 + 3300^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22005556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22005559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2750691 + ... + 2750698.

Almost surely, 2^22005556 is an apocalyptic number.

It is an amenable number.

22005556 is a deficient number, since it is larger than the sum of its proper divisors (16504174).

22005556 is a wasteful number, since it uses less digits than its factorization.

22005556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5501393 (or 5501391 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 22005556 is about 4691.0079940243. The cubic root of 22005556 is about 280.2275191567.

Adding to 22005556 its reverse (65550022), we get a palindrome (87555578).

The spelling of 22005556 in words is "twenty-two million, five thousand, five hundred fifty-six".