20213318 has 4 divisors (see below), whose sum is σ = 30319980. Its totient is φ = 10106658.

The previous prime is 20213317. The next prime is 20213351. The reversal of 20213318 is 81331202.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20213318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5053328 + ... + 5053331.

It is an arithmetic number, because the mean of its divisors is an integer number (7579995).

Almost surely, 2^20213318 is an apocalyptic number.

20213318 is a deficient number, since it is larger than the sum of its proper divisors (10106662).

20213318 is a wasteful number, since it uses less digits than its factorization.

20213318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106661.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20213318 is about 4495.9223747747. The cubic root of 20213318 is about 272.4034076753.

The spelling of 20213318 in words is "twenty million, two hundred thirteen thousand, three hundred eighteen".