20306203573 has 2 divisors, whose sum is σ = 20306203574. Its totient is φ = 20306203572.

The previous prime is 20306203559. The next prime is 20306203579. The reversal of 20306203573 is 37530260302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11163401649 + 9142801924 = 105657^2 + 95618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20306203573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20306203579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153101786 + 10153101787.

It is an arithmetic number, because the mean of its divisors is an integer number (10153101787).

Almost surely, 2^20306203573 is an apocalyptic number.

It is an amenable number.

20306203573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306203573 is an equidigital number, since it uses as much as digits as its factorization.

20306203573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 31.

Adding to 20306203573 its reverse (37530260302), we get a palindrome (57836463875).

The spelling of 20306203573 in words is "twenty billion, three hundred six million, two hundred three thousand, five hundred seventy-three".