22636240 has 80 divisors (see below), whose sum is σ = 59460480. Its totient is φ = 7938560.

The previous prime is 22636219. The next prime is 22636241. The reversal of 22636240 is 4263622.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×22636240² = 1024798722675200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22636241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25077 + ... + 25963.

It is an arithmetic number, because the mean of its divisors is an integer number (743256).

Almost surely, 2^22636240 is an apocalyptic number.

22636240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22636240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29730240).

22636240 is an abundant number, since it is smaller than the sum of its proper divisors (36824240).

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

22636240 is a wasteful number, since it uses less digits than its factorization.

22636240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 22636240 is about 4757.7557734714. The cubic root of 22636240 is about 282.8794702059.

Adding to 22636240 its reverse (4263622), we get a palindrome (26899862).

The spelling of 22636240 in words is "twenty-two million, six hundred thirty-six thousand, two hundred forty".