20543249 has 2 divisors, whose sum is σ = 20543250. Its totient is φ = 20543248.

The previous prime is 20543233. The next prime is 20543267. The reversal of 20543249 is 94234502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20539024 + 4225 = 4532^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 20543249 - 2⁴ = 20543233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20543849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271624 + 10271625.

It is an arithmetic number, because the mean of its divisors is an integer number (10271625).

Almost surely, 2^20543249 is an apocalyptic number.

It is an amenable number.

20543249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20543249 is an equidigital number, since it uses as much as digits as its factorization.

20543249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20543249 is about 4532.4661057751. The cubic root of 20543249 is about 273.8775137615.

The spelling of 20543249 in words is "twenty million, five hundred forty-three thousand, two hundred forty-nine".