22239820 has 12 divisors (see below), whose sum is σ = 46703664. Its totient is φ = 8895920.

The previous prime is 22239817. The next prime is 22239821. The reversal of 22239820 is 2893222.

It is not an unprimeable number, because it can be changed into a prime (22239821) 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, 555976 + ... + 556015.

It is an arithmetic number, because the mean of its divisors is an integer number (3891972).

Almost surely, 2^22239820 is an apocalyptic number.

22239820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22239820 is an abundant number, since it is smaller than the sum of its proper divisors (24463844).

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

22239820 is a wasteful number, since it uses less digits than its factorization.

22239820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112000 (or 1111998 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 22239820 is about 4715.9113647311. The cubic root of 22239820 is about 281.2184148893.

The spelling of 22239820 in words is "twenty-two million, two hundred thirty-nine thousand, eight hundred twenty".