20287199 has 2 divisors, whose sum is σ = 20287200. Its totient is φ = 20287198.

The previous prime is 20287187. The next prime is 20287207. The reversal of 20287199 is 99178202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20287199 - 2²⁴ = 3509983 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20287159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10143599 + 10143600.

It is an arithmetic number, because the mean of its divisors is an integer number (10143600).

Almost surely, 2^20287199 is an apocalyptic number.

20287199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20287199 is an equidigital number, since it uses as much as digits as its factorization.

20287199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 20287199 is about 4504.1313257941. The cubic root of 20287199 is about 272.7348882352.

The spelling of 20287199 in words is "twenty million, two hundred eighty-seven thousand, one hundred ninety-nine".