20860 has 24 divisors (see below), whose sum is σ = 50400. Its totient is φ = 7104.

The previous prime is 20857. The next prime is 20873. The reversal of 20860 is 6802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66 + ... + 214.

It is an arithmetic number, because the mean of its divisors is an integer number (2100).

2²⁰⁸⁶⁰ is an apocalyptic number.

20860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25200).

20860 is an abundant number, since it is smaller than the sum of its proper divisors (29540).

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

20860 is a wasteful number, since it uses less digits than its factorization.

20860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20860 is about 144.4299137990. The cubic root of 20860 is about 27.5277955876.

The spelling of 20860 in words is "twenty thousand, eight hundred sixty".