22087813 has 8 divisors (see below), whose sum is σ = 24224256. Its totient is φ = 19972800.

The previous prime is 22087799. The next prime is 22087817. The reversal of 22087813 is 31878022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22087813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22087817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3156 + ... + 7357.

It is an arithmetic number, because the mean of its divisors is an integer number (3028032).

Almost surely, 2^22087813 is an apocalyptic number.

It is an amenable number.

22087813 is a deficient number, since it is larger than the sum of its proper divisors (2136443).

22087813 is a wasteful number, since it uses less digits than its factorization.

22087813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 22087813 is about 4699.7673346667. The cubic root of 22087813 is about 280.5762494700.

The spelling of 22087813 in words is "twenty-two million, eighty-seven thousand, eight hundred thirteen".