20308320247 has 2 divisors, whose sum is σ = 20308320248. Its totient is φ = 20308320246.

The previous prime is 20308320211. The next prime is 20308320251. The reversal of 20308320247 is 74202380302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20308320247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20308320257) 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, 10154160123 + 10154160124.

It is an arithmetic number, because the mean of its divisors is an integer number (10154160124).

Almost surely, 2^20308320247 is an apocalyptic number.

20308320247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20308320247 is an equidigital number, since it uses as much as digits as its factorization.

20308320247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

The spelling of 20308320247 in words is "twenty billion, three hundred eight million, three hundred twenty thousand, two hundred forty-seven".