20315 has 8 divisors (see below), whose sum is σ = 25920. Its totient is φ = 15232.

The previous prime is 20297. The next prime is 20323. The reversal of 20315 is 51302.

20315 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 20315 - 2¹⁴ = 3931 is a prime.

20315 is strictly pandigital in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 20296 and 20305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35 + ... + 204.

It is an arithmetic number, because the mean of its divisors is an integer number (3240).

2²⁰³¹⁵ is an apocalyptic number.

20315 is a deficient number, since it is larger than the sum of its proper divisors (5605).

20315 is a wasteful number, since it uses less digits than its factorization.

20315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 20315 is about 142.5306984477. The cubic root of 20315 is about 27.2859414079.

Adding to 20315 its reverse (51302), we get a palindrome (71617).

The spelling of 20315 in words is "twenty thousand, three hundred fifteen".