20044813 has 2 divisors, whose sum is σ = 20044814. Its totient is φ = 20044812.

The previous prime is 20044811. The next prime is 20044823. The reversal of 20044813 is 31844002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17413929 + 2630884 = 4173^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 20044813 - 2¹ = 20044811 is a prime.

Together with 20044811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20044811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022406 + 10022407.

It is an arithmetic number, because the mean of its divisors is an integer number (10022407).

Almost surely, 2^20044813 is an apocalyptic number.

It is an amenable number.

20044813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20044813 is an equidigital number, since it uses as much as digits as its factorization.

20044813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20044813 is about 4477.1433973015. The cubic root of 20044813 is about 271.6443457558.

Adding to 20044813 its reverse (31844002), we get a palindrome (51888815).

The spelling of 20044813 in words is "twenty million, forty-four thousand, eight hundred thirteen".