22718140 has 24 divisors (see below), whose sum is σ = 48247920. Its totient is φ = 8984448.

The previous prime is 22718123. The next prime is 22718153. The reversal of 22718140 is 4181722.

It is a happy number.

It is a super-2 number, since 2×22718140² = 1032227770119200, which contains 22 as substring.

It is a congruent number.

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, 4602 + ... + 8161.

It is an arithmetic number, because the mean of its divisors is an integer number (2010330).

Almost surely, 2^22718140 is an apocalyptic number.

22718140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22718140 is an abundant number, since it is smaller than the sum of its proper divisors (25529780).

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

22718140 is a wasteful number, since it uses less digits than its factorization.

22718140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12861 (or 12859 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 22718140 is about 4766.3550014660. The cubic root of 22718140 is about 283.2202209007.

Adding to 22718140 its reverse (4181722), we get a palindrome (26899862).

The spelling of 22718140 in words is "twenty-two million, seven hundred eighteen thousand, one hundred forty".