20996844 has 48 divisors (see below), whose sum is σ = 54203520. Its totient is φ = 6272640.

The previous prime is 20996803. The next prime is 20996849. The reversal of 20996844 is 44869902.

It is a junction number, because it is equal to n+sod(n) for n = 20996796 and 20996805.

It is not an unprimeable number, because it can be changed into a prime (20996849) 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, 8547 + ... + 10725.

It is an arithmetic number, because the mean of its divisors is an integer number (1129240).

Almost surely, 2^20996844 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 20996844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27101760).

20996844 is an abundant number, since it is smaller than the sum of its proper divisors (33206676).

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

20996844 is a wasteful number, since it uses less digits than its factorization.

20996844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270 (or 2268 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 20996844 is about 4582.2313341864. The cubic root of 20996844 is about 275.8785960493.

It can be divided in two parts, 209968 and 44, that added together give a palindrome (210012).

The spelling of 20996844 in words is "twenty million, nine hundred ninety-six thousand, eight hundred forty-four".