20319620249 has 2 divisors, whose sum is σ = 20319620250. Its totient is φ = 20319620248.

The previous prime is 20319620197. The next prime is 20319620297. The reversal of 20319620249 is 94202691302.

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., 20069822224 + 249798025 = 141668^2 + 15805^2 .

It is a cyclic number.

It is not a de Polignac number, because 20319620249 - 2¹² = 20319616153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20319620749) 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, 10159810124 + 10159810125.

It is an arithmetic number, because the mean of its divisors is an integer number (10159810125).

Almost surely, 2^20319620249 is an apocalyptic number.

It is an amenable number.

20319620249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20319620249 is an equidigital number, since it uses as much as digits as its factorization.

20319620249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 20319620249 in words is "twenty billion, three hundred nineteen million, six hundred twenty thousand, two hundred forty-nine".