22720812 has 48 divisors (see below), whose sum is σ = 55272672. Its totient is φ = 7257600.

The previous prime is 22720811. The next prime is 22720829. The reversal of 22720812 is 21802722.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22720811) 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, 32062 + ... + 32762.

It is an arithmetic number, because the mean of its divisors is an integer number (1151514).

Almost surely, 2^22720812 is an apocalyptic number.

It is an amenable number.

22720812 is an abundant number, since it is smaller than the sum of its proper divisors (32551860).

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

22720812 is a wasteful number, since it uses less digits than its factorization.

22720812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 22720812 is about 4766.6352912720. The cubic root of 22720812 is about 283.2313241390.

It can be divided in two parts, 22720 and 812, that added together give a palindrome (23532).

The spelling of 22720812 in words is "twenty-two million, seven hundred twenty thousand, eight hundred twelve".