20129120647 has 2 divisors, whose sum is σ = 20129120648. Its totient is φ = 20129120646.

The previous prime is 20129120633. The next prime is 20129120659. The reversal of 20129120647 is 74602192102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20129120647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20129120677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064560323 + 10064560324.

It is an arithmetic number, because the mean of its divisors is an integer number (10064560324).

Almost surely, 2^20129120647 is an apocalyptic number.

20129120647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20129120647 is an equidigital number, since it uses as much as digits as its factorization.

20129120647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 20129120647 in words is "twenty billion, one hundred twenty-nine million, one hundred twenty thousand, six hundred forty-seven".