22718920 has 64 divisors (see below), whose sum is σ = 59875200. Its totient is φ = 7595520.

The previous prime is 22718909. The next prime is 22718923. The reversal of 22718920 is 2981722.

It is a super-2 number, since 2×22718920² = 1032298651932800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22718923) 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, 10491 + ... + 12469.

It is an arithmetic number, because the mean of its divisors is an integer number (935550).

Almost surely, 2^22718920 is an apocalyptic number.

22718920 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 22718920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29937600).

22718920 is an abundant number, since it is smaller than the sum of its proper divisors (37156280).

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

22718920 is a wasteful number, since it uses less digits than its factorization.

22718920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038 (or 2034 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 22718920 is about 4766.4368242955. The cubic root of 22718920 is about 283.2234622055.

The spelling of 22718920 in words is "twenty-two million, seven hundred eighteen thousand, nine hundred twenty".