22188820 has 24 divisors (see below), whose sum is σ = 46738944. Its totient is φ = 8848416.

The previous prime is 22188797. The next prime is 22188833. The reversal of 22188820 is 2888122.

It is a hoax number, since the sum of its digits (31) 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 7 ways as a sum of consecutive naturals, for example, 5829 + ... + 8851.

It is an arithmetic number, because the mean of its divisors is an integer number (1947456).

Almost surely, 2^22188820 is an apocalyptic number.

22188820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22188820 is an abundant number, since it is smaller than the sum of its proper divisors (24550124).

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

22188820 is a wasteful number, since it uses less digits than its factorization.

22188820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3399 (or 3397 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 22188820 is about 4710.5010349219. The cubic root of 22188820 is about 281.0032885048.

The spelling of 22188820 in words is "twenty-two million, one hundred eighty-eight thousand, eight hundred twenty".