20312203393 has 2 divisors, whose sum is σ = 20312203394. Its totient is φ = 20312203392.

The previous prime is 20312203291. The next prime is 20312203397. The reversal of 20312203393 is 39330221302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13454376049 + 6857827344 = 115993^2 + 82812^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312203393 - 2²¹ = 20310106241 is a prime.

It is not a weakly prime, because it can be changed into another prime (20312203397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156101696 + 10156101697.

It is an arithmetic number, because the mean of its divisors is an integer number (10156101697).

Almost surely, 2^20312203393 is an apocalyptic number.

It is an amenable number.

20312203393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312203393 is an equidigital number, since it uses as much as digits as its factorization.

20312203393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 20312203393 its reverse (39330221302), we get a palindrome (59642424695).

The spelling of 20312203393 in words is "twenty billion, three hundred twelve million, two hundred three thousand, three hundred ninety-three".