22143920 has 40 divisors (see below), whose sum is σ = 53151360. Its totient is φ = 8570880.

The previous prime is 22143899. The next prime is 22143929. The reversal of 22143920 is 2934122.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (22143929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1985 + ... + 6944.

It is an arithmetic number, because the mean of its divisors is an integer number (1328784).

Almost surely, 2^22143920 is an apocalyptic number.

22143920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22143920 is an abundant number, since it is smaller than the sum of its proper divisors (31007440).

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

22143920 is a wasteful number, since it uses less digits than its factorization.

22143920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8973 (or 8967 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 22143920 is about 4705.7326740902. The cubic root of 22143920 is about 280.8136198998.

The spelling of 22143920 in words is "twenty-two million, one hundred forty-three thousand, nine hundred twenty".