20548553 has 2 divisors, whose sum is σ = 20548554. Its totient is φ = 20548552.

The previous prime is 20548547. The next prime is 20548573. The reversal of 20548553 is 35584502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14531344 + 6017209 = 3812^2 + 2453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20548553 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 (20548513) 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, 10274276 + 10274277.

It is an arithmetic number, because the mean of its divisors is an integer number (10274277).

Almost surely, 2^20548553 is an apocalyptic number.

It is an amenable number.

20548553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20548553 is an equidigital number, since it uses as much as digits as its factorization.

20548553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 20548553 is about 4533.0511799449. The cubic root of 20548553 is about 273.9010822719.

The spelling of 20548553 in words is "twenty million, five hundred forty-eight thousand, five hundred fifty-three".