20190187 has 2 divisors, whose sum is σ = 20190188. Its totient is φ = 20190186.

The previous prime is 20190173. The next prime is 20190221. The reversal of 20190187 is 78109102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20190187 is a prime.

It is not a weakly prime, because it can be changed into another prime (20190487) 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, 10095093 + 10095094.

It is an arithmetic number, because the mean of its divisors is an integer number (10095094).

Almost surely, 2^20190187 is an apocalyptic number.

20190187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20190187 is an equidigital number, since it uses as much as digits as its factorization.

20190187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20190187 is about 4493.3491963123. The cubic root of 20190187 is about 272.2994602309.

Adding to 20190187 its reverse (78109102), we get a palindrome (98299289).

The spelling of 20190187 in words is "twenty million, one hundred ninety thousand, one hundred eighty-seven".