20503205053 has 2 divisors, whose sum is σ = 20503205054. Its totient is φ = 20503205052.

The previous prime is 20503204973. The next prime is 20503205057. The reversal of 20503205053 is 35050230502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20465591364 + 37613689 = 143058^2 + 6133^2 .

It is a cyclic number.

It is not a de Polignac number, because 20503205053 - 2⁹ = 20503204541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20503205057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251602526 + 10251602527.

It is an arithmetic number, because the mean of its divisors is an integer number (10251602527).

Almost surely, 2^20503205053 is an apocalyptic number.

It is an amenable number.

20503205053 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503205053 is an equidigital number, since it uses as much as digits as its factorization.

20503205053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 25.

Adding to 20503205053 its reverse (35050230502), we get a palindrome (55553435555).

The spelling of 20503205053 in words is "twenty billion, five hundred three million, two hundred five thousand, fifty-three".