22188020 has 12 divisors (see below), whose sum is σ = 46594884. Its totient is φ = 8875200.

The previous prime is 22188007. The next prime is 22188053. The reversal of 22188020 is 2088122.

It can be written as a sum of positive squares in 2 ways, for example, as 2598544 + 19589476 = 1612^2 + 4426^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

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, 554681 + ... + 554720.

It is an arithmetic number, because the mean of its divisors is an integer number (3882907).

Almost surely, 2^22188020 is an apocalyptic number.

22188020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22188020 is an abundant number, since it is smaller than the sum of its proper divisors (24406864).

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

22188020 is a wasteful number, since it uses less digits than its factorization.

22188020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109410 (or 1109408 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 22188020 is about 4710.4161174996. The cubic root of 22188020 is about 280.9999113486. Note that the first 4 decimals are identical.

The spelling of 22188020 in words is "twenty-two million, one hundred eighty-eight thousand, twenty".