20554549 has 2 divisors, whose sum is σ = 20554550. Its totient is φ = 20554548.

The previous prime is 20554529. The next prime is 20554553. The reversal of 20554549 is 94545502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 8892324 = 3415^2 + 2982^2 .

It is a cyclic number.

It is not a de Polignac number, because 20554549 - 2⁵ = 20554517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20554529) 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, 10277274 + 10277275.

It is an arithmetic number, because the mean of its divisors is an integer number (10277275).

Almost surely, 2^20554549 is an apocalyptic number.

It is an amenable number.

20554549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554549 is an equidigital number, since it uses as much as digits as its factorization.

20554549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 20554549 is about 4533.7124963985. The cubic root of 20554549 is about 273.9277208252.

The spelling of 20554549 in words is "twenty million, five hundred fifty-four thousand, five hundred forty-nine".