20944 has 40 divisors (see below), whose sum is σ = 53568. Its totient is φ = 7680.

The previous prime is 20939. The next prime is 20947. The reversal of 20944 is 44902.

It is a super-2 number, since 2×20944² = 877302272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1224 + ... + 1240.

2²⁰⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784).

20944 is an abundant number, since it is smaller than the sum of its proper divisors (32624).

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

20944 is a wasteful number, since it uses less digits than its factorization.

20944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20944 is about 144.7204201210. The cubic root of 20944 is about 27.5646961621.

It can be divided in two parts, 209 and 44, that added together give a triangular number (253 = T₂₂).

The spelling of 20944 in words is "twenty thousand, nine hundred forty-four".