18920347 has 2 divisors, whose sum is σ = 18920348. Its totient is φ = 18920346.

The previous prime is 18920327. The next prime is 18920353. The reversal of 18920347 is 74302981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18920347 - 2²³ = 10531739 is a prime.

It is not a weakly prime, because it can be changed into another prime (18920327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460173 + 9460174.

It is an arithmetic number, because the mean of its divisors is an integer number (9460174).

Almost surely, 2^18920347 is an apocalyptic number.

18920347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18920347 is an equidigital number, since it uses as much as digits as its factorization.

18920347 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 square root of 18920347 is about 4349.7525216959. The cubic root of 18920347 is about 266.4667545095.

The spelling of 18920347 in words is "eighteen million, nine hundred twenty thousand, three hundred forty-seven".