22066638 has 32 divisors (see below), whose sum is σ = 50682240. Its totient is φ = 6334560.

The previous prime is 22066621. The next prime is 22066643. The reversal of 22066638 is 83666022.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22066599 and 22066608.

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 15 ways as a sum of consecutive naturals, for example, 7545 + ... + 10052.

It is an arithmetic number, because the mean of its divisors is an integer number (1583820).

Almost surely, 2^22066638 is an apocalyptic number.

22066638 is an abundant number, since it is smaller than the sum of its proper divisors (28615602).

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

22066638 is a wasteful number, since it uses less digits than its factorization.

22066638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17632.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 22066638 is about 4697.5140233958. The cubic root of 22066638 is about 280.4865604689.

The spelling of 22066638 in words is "twenty-two million, sixty-six thousand, six hundred thirty-eight".