22031920 has 20 divisors (see below), whose sum is σ = 51224400. Its totient is φ = 8812736.

The previous prime is 22031899. The next prime is 22031921. The reversal of 22031920 is 2913022.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (22031921) 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, 137620 + ... + 137779.

It is an arithmetic number, because the mean of its divisors is an integer number (2561220).

Almost surely, 2^22031920 is an apocalyptic number.

22031920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22031920 is an abundant number, since it is smaller than the sum of its proper divisors (29192480).

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

22031920 is a wasteful number, since it uses less digits than its factorization.

22031920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275412 (or 275406 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 22031920 is about 4693.8172099050. The cubic root of 22031920 is about 280.3393843887.

Adding to 22031920 its reverse (2913022), we get a palindrome (24944942).

The spelling of 22031920 in words is "twenty-two million, thirty-one thousand, nine hundred twenty".