20311230493 has 2 divisors, whose sum is σ = 20311230494. Its totient is φ = 20311230492.

The previous prime is 20311230481. The next prime is 20311230503. The reversal of 20311230493 is 39403211302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17290409049 + 3020821444 = 131493^2 + 54962^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311230493 - 2²⁹ = 19774359581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311230193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155615246 + 10155615247.

It is an arithmetic number, because the mean of its divisors is an integer number (10155615247).

Almost surely, 2^20311230493 is an apocalyptic number.

It is an amenable number.

20311230493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311230493 is an equidigital number, since it uses as much as digits as its factorization.

20311230493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 20311230493 its reverse (39403211302), we get a palindrome (59714441795).

The spelling of 20311230493 in words is "twenty billion, three hundred eleven million, two hundred thirty thousand, four hundred ninety-three".