22180920287 has 4 divisors (see below), whose sum is σ = 22181262720. Its totient is φ = 22180577856.

The previous prime is 22180920277. The next prime is 22180920319. The reversal of 22180920287 is 78202908122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22180920287 - 2¹⁰ = 22180919263 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 (22180920227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41087 + ... + 214592.

It is an arithmetic number, because the mean of its divisors is an integer number (5545315680).

Almost surely, 2^22180920287 is an apocalyptic number.

22180920287 is a deficient number, since it is larger than the sum of its proper divisors (342433).

22180920287 is an equidigital number, since it uses as much as digits as its factorization.

22180920287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342432.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 22180920287 in words is "twenty-two billion, one hundred eighty million, nine hundred twenty thousand, two hundred eighty-seven".