20908186147 has 2 divisors, whose sum is σ = 20908186148. Its totient is φ = 20908186146.

The previous prime is 20908186067. The next prime is 20908186213. The reversal of 20908186147 is 74168180902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20908186147 - 2²⁷ = 20773968419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20908186097 and 20908186106.

It is not a weakly prime, because it can be changed into another prime (20908187147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454093073 + 10454093074.

It is an arithmetic number, because the mean of its divisors is an integer number (10454093074).

Almost surely, 2^20908186147 is an apocalyptic number.

20908186147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908186147 is an equidigital number, since it uses as much as digits as its factorization.

20908186147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 20908186147 in words is "twenty billion, nine hundred eight million, one hundred eighty-six thousand, one hundred forty-seven".