20572553 has 2 divisors, whose sum is σ = 20572554. Its totient is φ = 20572552.

The previous prime is 20572549. The next prime is 20572597. The reversal of 20572553 is 35527502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16540489 + 4032064 = 4067^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 20572553 - 2² = 20572549 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 (20572523) 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, 10286276 + 10286277.

It is an arithmetic number, because the mean of its divisors is an integer number (10286277).

Almost surely, 2^20572553 is an apocalyptic number.

It is an amenable number.

20572553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20572553 is an equidigital number, since it uses as much as digits as its factorization.

20572553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10500, while the sum is 29.

The square root of 20572553 is about 4535.6976310155. The cubic root of 20572553 is about 274.0076764504.

The spelling of 20572553 in words is "twenty million, five hundred seventy-two thousand, five hundred fifty-three".