18020851 has 2 divisors, whose sum is σ = 18020852. Its totient is φ = 18020850.

The previous prime is 18020837. The next prime is 18020897. The reversal of 18020851 is 15802081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18020851 - 2⁵ = 18020819 is a prime.

It is not a weakly prime, because it can be changed into another prime (18020831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010425 + 9010426.

It is an arithmetic number, because the mean of its divisors is an integer number (9010426).

Almost surely, 2^18020851 is an apocalyptic number.

18020851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18020851 is an equidigital number, since it uses as much as digits as its factorization.

18020851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 18020851 is about 4245.0972898156. The cubic root of 18020851 is about 262.1752949622.

The spelling of 18020851 in words is "eighteen million, twenty thousand, eight hundred fifty-one".