20028287 has 2 divisors, whose sum is σ = 20028288. Its totient is φ = 20028286.

The previous prime is 20028277. The next prime is 20028289. The reversal of 20028287 is 78282002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20028287 - 2⁸ = 20028031 is a prime.

It is a super-2 number, since 2×20028287² = 802264560308738, which contains 22 as substring.

Together with 20028289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20028289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10014143 + 10014144.

It is an arithmetic number, because the mean of its divisors is an integer number (10014144).

Almost surely, 2^20028287 is an apocalyptic number.

20028287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20028287 is an equidigital number, since it uses as much as digits as its factorization.

20028287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20028287 is about 4475.2974202839. The cubic root of 20028287 is about 271.5696725934.

The spelling of 20028287 in words is "twenty million, twenty-eight thousand, two hundred eighty-seven".