22091805 has 16 divisors (see below), whose sum is σ = 39274560. Its totient is φ = 11782224.

The previous prime is 22091803. The next prime is 22091807. The reversal of 22091805 is 50819022.

It is an interprime number because it is at equal distance from previous prime (22091803) and next prime (22091807).

It is not a de Polignac number, because 22091805 - 2¹ = 22091803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22091803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81687 + ... + 81956.

It is an arithmetic number, because the mean of its divisors is an integer number (2454660).

Almost surely, 2^22091805 is an apocalyptic number.

It is an amenable number.

22091805 is a deficient number, since it is larger than the sum of its proper divisors (17182755).

22091805 is a wasteful number, since it uses less digits than its factorization.

22091805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163657 (or 163651 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 22091805 is about 4700.1920173542. The cubic root of 22091805 is about 280.5931515948.

The spelling of 22091805 in words is "twenty-two million, ninety-one thousand, eight hundred five".