20553773 has 2 divisors, whose sum is σ = 20553774. Its totient is φ = 20553772.

The previous prime is 20553739. The next prime is 20553781. The reversal of 20553773 is 37735502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11202409 + 9351364 = 3347^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 20553773 - 2⁸ = 20553517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20553703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276886 + 10276887.

It is an arithmetic number, because the mean of its divisors is an integer number (10276887).

Almost surely, 2^20553773 is an apocalyptic number.

It is an amenable number.

20553773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553773 is an equidigital number, since it uses as much as digits as its factorization.

20553773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050, while the sum is 32.

The square root of 20553773 is about 4533.6269145134. The cubic root of 20553773 is about 273.9242735658.

The spelling of 20553773 in words is "twenty million, five hundred fifty-three thousand, seven hundred seventy-three".