22161604 has 24 divisors (see below), whose sum is σ = 40783680. Its totient is φ = 10516704.

The previous prime is 22161599. The next prime is 22161617. The reversal of 22161604 is 40616122.

It is a super-2 number, since 2×22161604² = 982273383705632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11922 + ... + 13654.

It is an arithmetic number, because the mean of its divisors is an integer number (1699320).

Almost surely, 2^22161604 is an apocalyptic number.

It is an amenable number.

22161604 is a deficient number, since it is larger than the sum of its proper divisors (18622076).

22161604 is a wasteful number, since it uses less digits than its factorization.

22161604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22161604 is about 4707.6112838679. The cubic root of 22161604 is about 280.8883520268. Note that the first 3 decimals are identical.

Adding to 22161604 its reverse (40616122), we get a palindrome (62777726).

The spelling of 22161604 in words is "twenty-two million, one hundred sixty-one thousand, six hundred four".