20312 has 8 divisors (see below), whose sum is σ = 38100. Its totient is φ = 10152.

The previous prime is 20297. The next prime is 20323. The reversal of 20312 is 21302.

It is a tau number, because it is divible by the number of its divisors (8).

It is a Harshad number since it is a multiple of its sum of digits (8), and also a Moran number because the ratio is a prime number: 2539 = 20312 / (2 + 0 + 3 + 1 + 2).

It is a plaindrome in base 5.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 20312.

It is a congruent number.

It is an unprimeable number.

20312 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, 1262 + ... + 1277.

2²⁰³¹² is an apocalyptic number.

It is an amenable number.

20312 is a deficient number, since it is larger than the sum of its proper divisors (17788).

20312 is a wasteful number, since it uses less digits than its factorization.

20312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545 (or 2541 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 20312 is about 142.5201740106. The cubic root of 20312 is about 27.2845981992.

Adding to 20312 its reverse (21302), we get a palindrome (41614).

Subtracting 20312 from its reverse (21302), we obtain a triangular number (990 = T₄₄).

The spelling of 20312 in words is "twenty thousand, three hundred twelve", and thus it is an iban number.