20886 has 12 divisors (see below), whose sum is σ = 42492. Its totient is φ = 6844.

The previous prime is 20879. The next prime is 20887. The reversal of 20886 is 68802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887) 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 5 ways as a sum of consecutive naturals, for example, 325 + ... + 383.

It is an arithmetic number, because the mean of its divisors is an integer number (3541).

2²⁰⁸⁸⁶ is an apocalyptic number.

20886 is an abundant number, since it is smaller than the sum of its proper divisors (21606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21246).

20886 is an equidigital number, since it uses as much as digits as its factorization.

20886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20886 is about 144.5198948242. The cubic root of 20886 is about 27.5392277630.

Adding to 20886 its sum of digits (24), we get a triangular number (20910 = T₂₀₄).

Multiplying 20886 by its sum of digits (24), we get a square (501264 = 708²).

The spelling of 20886 in words is "twenty thousand, eight hundred eighty-six".