22090815 has 24 divisors (see below), whose sum is σ = 38449008. Its totient is φ = 11733120.

The previous prime is 22090811. The next prime is 22090819. The reversal of 22090815 is 51809022.

It is an interprime number because it is at equal distance from previous prime (22090811) and next prime (22090819).

It is not a de Polignac number, because 22090815 - 2² = 22090811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22090811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11772 + ... + 13518.

It is an arithmetic number, because the mean of its divisors is an integer number (1602042).

Almost surely, 2^22090815 is an apocalyptic number.

22090815 is a deficient number, since it is larger than the sum of its proper divisors (16358193).

22090815 is a wasteful number, since it uses less digits than its factorization.

22090815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039 (or 2036 counting only the distinct ones).

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

The square root of 22090815 is about 4700.0867013280. The cubic root of 22090815 is about 280.5889601255.

Adding to 22090815 its reverse (51809022), we get a palindrome (73899837).

The spelling of 22090815 in words is "twenty-two million, ninety thousand, eight hundred fifteen".