22518224 has 10 divisors (see below), whose sum is σ = 43629090. Its totient is φ = 11259104.

The previous prime is 22518193. The next prime is 22518229. The reversal of 22518224 is 42281522.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 7463824 = 3880^2 + 2732^2 .

It is a super-2 number, since 2×22518224² = 1014140824228352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22518193 and 22518202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22518229) 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 as a sum of consecutive naturals, namely, 703679 + ... + 703710.

It is an arithmetic number, because the mean of its divisors is an integer number (4362909).

Almost surely, 2^22518224 is an apocalyptic number.

It is an amenable number.

22518224 is a deficient number, since it is larger than the sum of its proper divisors (21110866).

22518224 is a wasteful number, since it uses less digits than its factorization.

22518224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407397 (or 1407391 counting only the distinct ones).

The product of its digits is 2560, while the sum is 26.

The square root of 22518224 is about 4745.3370797026. The cubic root of 22518224 is about 282.3870078313.

Adding to 22518224 its reverse (42281522), we get a palindrome (64799746).

The spelling of 22518224 in words is "twenty-two million, five hundred eighteen thousand, two hundred twenty-four".