22012220 has 12 divisors (see below), whose sum is σ = 46225704. Its totient is φ = 8804880.

The previous prime is 22012187. The next prime is 22012231. The reversal of 22012220 is 2221022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550286 + ... + 550325.

It is an arithmetic number, because the mean of its divisors is an integer number (3852142).

Almost surely, 2^22012220 is an apocalyptic number.

22012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22012220 is an abundant number, since it is smaller than the sum of its proper divisors (24213484).

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

22012220 is a wasteful number, since it uses less digits than its factorization.

22012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100620 (or 1100618 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22012220 is about 4691.7182353590. The cubic root of 22012220 is about 280.2558036456.

Adding to 22012220 its reverse (2221022), we get a palindrome (24233242).

The spelling of 22012220 in words is "twenty-two million, twelve thousand, two hundred twenty".