22021790 has 16 divisors (see below), whose sum is σ = 45302112. Its totient is φ = 7550304.

The previous prime is 22021739. The next prime is 22021799. The reversal of 22021790 is 9712022.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021799) 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, 157229 + ... + 157368.

It is an arithmetic number, because the mean of its divisors is an integer number (2831382).

Almost surely, 2^22021790 is an apocalyptic number.

22021790 is an abundant number, since it is smaller than the sum of its proper divisors (23280322).

22021790 is a wasteful number, since it uses less digits than its factorization.

22021790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314611.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 22021790 is about 4692.7380067504. The cubic root of 22021790 is about 280.2964122932.

The spelling of 22021790 in words is "twenty-two million, twenty-one thousand, seven hundred ninety".