22720012 has 12 divisors (see below), whose sum is σ = 45440080. Its totient is φ = 9737136.

The previous prime is 22720001. The next prime is 22720013. The reversal of 22720012 is 21002722.

22720012 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (22720013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405687 + ... + 405742.

Almost surely, 2^22720012 is an apocalyptic number.

It is an amenable number.

22720012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22720012 is a wasteful number, since it uses less digits than its factorization.

22720012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811440 (or 811438 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 22720012 is about 4766.5513738971. The cubic root of 22720012 is about 283.2279999075.

Adding to 22720012 its reverse (21002722), we get a palindrome (43722734).

The spelling of 22720012 in words is "twenty-two million, seven hundred twenty thousand, twelve".