18820259 has 2 divisors, whose sum is σ = 18820260. Its totient is φ = 18820258.

The previous prime is 18820253. The next prime is 18820261. The reversal of 18820259 is 95202881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18820259 is a prime.

Together with 18820261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18820253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9410129 + 9410130.

It is an arithmetic number, because the mean of its divisors is an integer number (9410130).

Almost surely, 2^18820259 is an apocalyptic number.

18820259 is a deficient number, since it is larger than the sum of its proper divisors (1).

18820259 is an equidigital number, since it uses as much as digits as its factorization.

18820259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18820259 is about 4338.2322436679. The cubic root of 18820259 is about 265.9960568130.

The spelling of 18820259 in words is "eighteen million, eight hundred twenty thousand, two hundred fifty-nine".