22731018 has 8 divisors (see below), whose sum is σ = 45462048. Its totient is φ = 7577004.

The previous prime is 22731013. The next prime is 22731019. The reversal of 22731018 is 81013722.

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

22731018 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (22731013) 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, 1894246 + ... + 1894257.

It is an arithmetic number, because the mean of its divisors is an integer number (5682756).

Almost surely, 2^22731018 is an apocalyptic number.

22731018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22731018 is a wasteful number, since it uses less digits than its factorization.

22731018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3788508.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 22731018 is about 4767.7057375639. The cubic root of 22731018 is about 283.2737261767.

The spelling of 22731018 in words is "twenty-two million, seven hundred thirty-one thousand, eighteen".