20875 has 8 divisors (see below), whose sum is σ = 26208. Its totient is φ = 16600.

The previous prime is 20873. The next prime is 20879. The reversal of 20875 is 57802.

20875 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 20875 - 2¹ = 20873 is a prime.

It is a Duffinian number.

20875 is strictly pandigital in base 6.

20875 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (20873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42 + ... + 208.

It is an arithmetic number, because the mean of its divisors is an integer number (3276).

2²⁰⁸⁷⁵ is an apocalyptic number.

20875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20875 is a deficient number, since it is larger than the sum of its proper divisors (5333).

20875 is an equidigital number, since it uses as much as digits as its factorization.

20875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20875 is about 144.4818327680. The cubic root of 20875 is about 27.5343922319.

The spelling of 20875 in words is "twenty thousand, eight hundred seventy-five".