20263 has 4 divisors (see below), whose sum is σ = 21168. Its totient is φ = 19360.

The previous prime is 20261. The next prime is 20269. The reversal of 20263 is 36202.

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

It is a cyclic number.

It is not a de Polignac number, because 20263 - 2¹ = 20261 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 0 + 2⁹ + 6² + 3⁹ .

It is a Duffinian number.

It is a nialpdrome in base 12 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418 + ... + 463.

It is an arithmetic number, because the mean of its divisors is an integer number (5292).

2²⁰²⁶³ is an apocalyptic number.

20263 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20263 is a deficient number, since it is larger than the sum of its proper divisors (905).

20263 is an equidigital number, since it uses as much as digits as its factorization.

20263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20263 is about 142.3481647230. The cubic root of 20263 is about 27.2626403775.

Adding to 20263 its reverse (36202), we get a palindrome (56465).

The spelling of 20263 in words is "twenty thousand, two hundred sixty-three".