22018312 has 16 divisors (see below), whose sum is σ = 42291900. Its totient is φ = 10740480.

The previous prime is 22018309. The next prime is 22018343. The reversal of 22018312 is 21381022.

It can be written as a sum of positive squares in 2 ways, for example, as 21288996 + 729316 = 4614^2 + 854^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22018312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33237 + ... + 33892.

Almost surely, 2^22018312 is an apocalyptic number.

It is an amenable number.

22018312 is a deficient number, since it is larger than the sum of its proper divisors (20273588).

22018312 is a wasteful number, since it uses less digits than its factorization.

22018312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67176 (or 67172 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 22018312 is about 4692.3674195442. The cubic root of 22018312 is about 280.2816553600.

Adding to 22018312 its reverse (21381022), we get a palindrome (43399334).

The spelling of 22018312 in words is "twenty-two million, eighteen thousand, three hundred twelve".