20185259 has 2 divisors, whose sum is σ = 20185260. Its totient is φ = 20185258.

The previous prime is 20185241. The next prime is 20185261. The reversal of 20185259 is 95258102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20185259 - 2⁸ = 20185003 is a prime.

Together with 20185261, 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 (20185159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10092629 + 10092630.

It is an arithmetic number, because the mean of its divisors is an integer number (10092630).

Almost surely, 2^20185259 is an apocalyptic number.

20185259 is a deficient number, since it is larger than the sum of its proper divisors (1).

20185259 is an equidigital number, since it uses as much as digits as its factorization.

20185259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20185259 is about 4492.8007968304. The cubic root of 20185259 is about 272.2773042379.

The spelling of 20185259 in words is "twenty million, one hundred eighty-five thousand, two hundred fifty-nine".