20318 has 4 divisors (see below), whose sum is σ = 30480. Its totient is φ = 10158.

The previous prime is 20297. The next prime is 20323. The reversal of 20318 is 81302.

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

It is a super-2 number, since 2×20318² = 825642248, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 5.

It is a zygodrome in base 5.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20318.

It is an unprimeable number.

20318 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5078 + ... + 5081.

It is an arithmetic number, because the mean of its divisors is an integer number (7620).

2²⁰³¹⁸ is an apocalyptic number.

20318 is a deficient number, since it is larger than the sum of its proper divisors (10162).

20318 is a wasteful number, since it uses less digits than its factorization.

20318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20318 is about 142.5412221079. The cubic root of 20318 is about 27.2872844844.

The spelling of 20318 in words is "twenty thousand, three hundred eighteen".