20830 has 8 divisors (see below), whose sum is σ = 37512. Its totient is φ = 8328.

The previous prime is 20809. The next prime is 20849. The reversal of 20830 is 3802.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (4689).

2²⁰⁸³⁰ is an apocalyptic number.

20830 is a deficient number, since it is larger than the sum of its proper divisors (16682).

20830 is a wasteful number, since it uses less digits than its factorization.

20830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20830 is about 144.3260198301. The cubic root of 20830 is about 27.5145928060.

The spelling of 20830 in words is "twenty thousand, eight hundred thirty".