20544889 has 2 divisors, whose sum is σ = 20544890. Its totient is φ = 20544888.

The previous prime is 20544851. The next prime is 20544899. The reversal of 20544889 is 98844502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 2862864 = 4205^2 + 1692^2 .

It is a cyclic number.

It is not a de Polignac number, because 20544889 - 2¹⁹ = 20020601 is a prime.

It is not a weakly prime, because it can be changed into another prime (20544809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272444 + 10272445.

It is an arithmetic number, because the mean of its divisors is an integer number (10272445).

Almost surely, 2^20544889 is an apocalyptic number.

It is an amenable number.

20544889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20544889 is an equidigital number, since it uses as much as digits as its factorization.

20544889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20544889 is about 4532.6470191269. The cubic root of 20544889 is about 273.8848015923.

The spelling of 20544889 in words is "twenty million, five hundred forty-four thousand, eight hundred eighty-nine".