22087381 has 4 divisors (see below), whose sum is σ = 22099392. Its totient is φ = 22075372.

The previous prime is 22087361. The next prime is 22087411. The reversal of 22087381 is 18378022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22087381 - 2⁵ = 22087349 is a prime.

It is a super-2 number, since 2×22087381² = 975704798878322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22087361) 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 3 ways as a sum of consecutive naturals, for example, 2605 + ... + 7138.

It is an arithmetic number, because the mean of its divisors is an integer number (5524848).

Almost surely, 2^22087381 is an apocalyptic number.

It is an amenable number.

22087381 is a deficient number, since it is larger than the sum of its proper divisors (12011).

22087381 is an equidigital number, since it uses as much as digits as its factorization.

22087381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010.

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

The square root of 22087381 is about 4699.7213747200. The cubic root of 22087381 is about 280.5744202603.

The spelling of 22087381 in words is "twenty-two million, eighty-seven thousand, three hundred eighty-one".