20181859 has 2 divisors, whose sum is σ = 20181860. Its totient is φ = 20181858.

The previous prime is 20181851. The next prime is 20181937. The reversal of 20181859 is 95818102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20181859 - 2³ = 20181851 is a prime.

It is not a weakly prime, because it can be changed into another prime (20181851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10090929 + 10090930.

It is an arithmetic number, because the mean of its divisors is an integer number (10090930).

Almost surely, 2^20181859 is an apocalyptic number.

20181859 is a deficient number, since it is larger than the sum of its proper divisors (1).

20181859 is an equidigital number, since it uses as much as digits as its factorization.

20181859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 20181859 is about 4492.4223977716. The cubic root of 20181859 is about 272.2620159390.

The spelling of 20181859 in words is "twenty million, one hundred eighty-one thousand, eight hundred fifty-nine".