22180019 has 4 divisors (see below), whose sum is σ = 23484744. Its totient is φ = 20875296.

The previous prime is 22180013. The next prime is 22180031. The reversal of 22180019 is 91008122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22180019 is a prime.

It is a super-2 number, since 2×22180019² = 983906485680722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22179976 and 22180003.

It is not an unprimeable number, because it can be changed into a prime (22180013) 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, 652337 + ... + 652370.

It is an arithmetic number, because the mean of its divisors is an integer number (5871186).

Almost surely, 2^22180019 is an apocalyptic number.

22180019 is a deficient number, since it is larger than the sum of its proper divisors (1304725).

22180019 is a wasteful number, since it uses less digits than its factorization.

22180019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304724.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 22180019 is about 4709.5667528978. The cubic root of 22180019 is about 280.9661310986.

The spelling of 22180019 in words is "twenty-two million, one hundred eighty thousand, nineteen".