20944081 has 4 divisors (see below), whose sum is σ = 20967012. Its totient is φ = 20921152.

The previous prime is 20944069. The next prime is 20944087. The reversal of 20944081 is 18044902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9247681 + 11696400 = 3041^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 20944081 - 2⁷ = 20943953 is a prime.

It is a super-2 number, since 2×20944081² = 877309057869122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20944087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10036 + ... + 11941.

It is an arithmetic number, because the mean of its divisors is an integer number (5241753).

Almost surely, 2^20944081 is an apocalyptic number.

It is an amenable number.

20944081 is a deficient number, since it is larger than the sum of its proper divisors (22931).

20944081 is an equidigital number, since it uses as much as digits as its factorization.

20944081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22930.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20944081 is about 4576.4703648117. The cubic root of 20944081 is about 275.6473169713.

Adding to 20944081 its reverse (18044902), we get a palindrome (38988983).

The spelling of 20944081 in words is "twenty million, nine hundred forty-four thousand, eighty-one".