22091993 has 24 divisors (see below), whose sum is σ = 29696544. Its totient is φ = 16195200.

The previous prime is 22091947. The next prime is 22091999. The reversal of 22091993 is 39919022.

It is not a de Polignac number, because 22091993 - 2¹⁴ = 22075609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22091999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7958 + ... + 10368.

It is an arithmetic number, because the mean of its divisors is an integer number (1237356).

Almost surely, 2^22091993 is an apocalyptic number.

It is an amenable number.

22091993 is a deficient number, since it is larger than the sum of its proper divisors (7604551).

22091993 is a wasteful number, since it uses less digits than its factorization.

22091993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453 (or 2446 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 22091993 is about 4700.2120164946. The cubic root of 22091993 is about 280.5939475365.

The spelling of 22091993 in words is "twenty-two million, ninety-one thousand, nine hundred ninety-three".