20867 has 8 divisors (see below), whose sum is σ = 26112. Its totient is φ = 16200.

The previous prime is 20857. The next prime is 20873. The reversal of 20867 is 76802.

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

It is a cyclic number.

It is not a de Polignac number, because 20867 - 2⁸ = 20611 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (20807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59 + ... + 212.

It is an arithmetic number, because the mean of its divisors is an integer number (3264).

2²⁰⁸⁶⁷ is an apocalyptic number.

20867 is a deficient number, since it is larger than the sum of its proper divisors (5245).

20867 is a wasteful number, since it uses less digits than its factorization.

20867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20867 is about 144.4541449734. The cubic root of 20867 is about 27.5308744150.

The spelling of 20867 in words is "twenty thousand, eight hundred sixty-seven".