22066590 has 128 divisors (see below), whose sum is σ = 66769920. Its totient is φ = 4543488.

The previous prime is 22066573. The next prime is 22066613. The reversal of 22066590 is 9566022.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 161002 + ... + 161138.

It is an arithmetic number, because the mean of its divisors is an integer number (521640).

Almost surely, 2^22066590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22066590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33384960).

22066590 is an abundant number, since it is smaller than the sum of its proper divisors (44703330).

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

22066590 is a wasteful number, since it uses less digits than its factorization.

22066590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 22066590 is about 4697.5089143077. The cubic root of 22066590 is about 280.4863570946.

The spelling of 22066590 in words is "twenty-two million, sixty-six thousand, five hundred ninety".