22518252 has 18 divisors (see below), whose sum is σ = 56921228. Its totient is φ = 7506072.

The previous prime is 22518233. The next prime is 22518271. The reversal of 22518252 is 25281522.

It is an interprime number because it is at equal distance from previous prime (22518233) and next prime (22518271).

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 312718 + ... + 312789.

Almost surely, 2^22518252 is an apocalyptic number.

It is an amenable number.

22518252 is an abundant number, since it is smaller than the sum of its proper divisors (34402976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22518252 is a wasteful number, since it uses less digits than its factorization.

22518252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625517 (or 625512 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 22518252 is about 4745.3400299662. The cubic root of 22518252 is about 282.3871248748.

Adding to 22518252 its reverse (25281522), we get a palindrome (47799774).

The spelling of 22518252 in words is "twenty-two million, five hundred eighteen thousand, two hundred fifty-two".