20315307499 has 2 divisors, whose sum is σ = 20315307500. Its totient is φ = 20315307498.

The previous prime is 20315307421. The next prime is 20315307533. The reversal of 20315307499 is 99470351302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20315307499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20315317499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157653749 + 10157653750.

It is an arithmetic number, because the mean of its divisors is an integer number (10157653750).

Almost surely, 2^20315307499 is an apocalyptic number.

20315307499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315307499 is an equidigital number, since it uses as much as digits as its factorization.

20315307499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 20315307499 in words is "twenty billion, three hundred fifteen million, three hundred seven thousand, four hundred ninety-nine".