22001818 has 8 divisors (see below), whose sum is σ = 33090048. Its totient is φ = 10971804.

The previous prime is 22001813. The next prime is 22001821. The reversal of 22001818 is 81810022.

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

It is not an unprimeable number, because it can be changed into a prime (22001813) 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, 13596 + ... + 15127.

It is an arithmetic number, because the mean of its divisors is an integer number (4136256).

Almost surely, 2^22001818 is an apocalyptic number.

22001818 is a deficient number, since it is larger than the sum of its proper divisors (11088230).

22001818 is a wasteful number, since it uses less digits than its factorization.

22001818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29108.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 22001818 is about 4690.6095552710. The cubic root of 22001818 is about 280.2116511976.

The spelling of 22001818 in words is "twenty-two million, one thousand, eight hundred eighteen".