20503204973 has 2 divisors, whose sum is σ = 20503204974. Its totient is φ = 20503204972.

The previous prime is 20503204963. The next prime is 20503205053. The reversal of 20503204973 is 37940230502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18851839204 + 1651365769 = 137302^2 + 40637^2 .

It is a cyclic number.

It is not a de Polignac number, because 20503204973 - 2⁴ = 20503204957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20503204963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251602486 + 10251602487.

It is an arithmetic number, because the mean of its divisors is an integer number (10251602487).

Almost surely, 2^20503204973 is an apocalyptic number.

It is an amenable number.

20503204973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503204973 is an equidigital number, since it uses as much as digits as its factorization.

20503204973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 35.

It can be divided in two parts, 2050 and 3204973, that added together give a palindrome (3207023).

The spelling of 20503204973 in words is "twenty billion, five hundred three million, two hundred four thousand, nine hundred seventy-three".