20930 has 32 divisors (see below), whose sum is σ = 48384. Its totient is φ = 6336.

The previous prime is 20929. The next prime is 20939. The reversal of 20930 is 3902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20930.

It is not an unprimeable number, because it can be changed into a prime (20939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899 + ... + 921.

It is an arithmetic number, because the mean of its divisors is an integer number (1512).

2²⁰⁹³⁰ is an apocalyptic number.

20930 is an abundant number, since it is smaller than the sum of its proper divisors (27454).

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 (24192).

20930 is a wasteful number, since it uses less digits than its factorization.

20930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 20930 is about 144.6720429109. The cubic root of 20930 is about 27.5585529267.

The spelling of 20930 in words is "twenty thousand, nine hundred thirty".