18920207 has 2 divisors, whose sum is σ = 18920208. Its totient is φ = 18920206.

The previous prime is 18920203. The next prime is 18920233. The reversal of 18920207 is 70202981.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (70202981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18920207 - 2² = 18920203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18920207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18920203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460103 + 9460104.

It is an arithmetic number, because the mean of its divisors is an integer number (9460104).

Almost surely, 2^18920207 is an apocalyptic number.

18920207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18920207 is an equidigital number, since it uses as much as digits as its factorization.

18920207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18920207 is about 4349.7364287966. The cubic root of 18920207 is about 266.4660972728.

The spelling of 18920207 in words is "eighteen million, nine hundred twenty thousand, two hundred seven".