20862 has 24 divisors (see below), whose sum is σ = 48360. Its totient is φ = 6480.

The previous prime is 20857. The next prime is 20873. The reversal of 20862 is 26802.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

20862 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312 + ... + 372.

It is an arithmetic number, because the mean of its divisors is an integer number (2015).

2²⁰⁸⁶² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24180).

20862 is an abundant number, since it is smaller than the sum of its proper divisors (27498).

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

20862 is a wasteful number, since it uses less digits than its factorization.

20862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20862 is about 144.4368374065. The cubic root of 20862 is about 27.5286753229.

The spelling of 20862 in words is "twenty thousand, eight hundred sixty-two".