20808114647 has 2 divisors, whose sum is σ = 20808114648. Its totient is φ = 20808114646.

The previous prime is 20808114643. The next prime is 20808114653. The reversal of 20808114647 is 74641180802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20808114647 - 2² = 20808114643 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20808114643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10404057323 + 10404057324.

It is an arithmetic number, because the mean of its divisors is an integer number (10404057324).

Almost surely, 2^20808114647 is an apocalyptic number.

20808114647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20808114647 is an equidigital number, since it uses as much as digits as its factorization.

20808114647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 41.

The spelling of 20808114647 in words is "twenty billion, eight hundred eight million, one hundred fourteen thousand, six hundred forty-seven".