20002187 has 2 divisors, whose sum is σ = 20002188. Its totient is φ = 20002186.

The previous prime is 20002159. The next prime is 20002189. The reversal of 20002187 is 78120002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20002187 - 2⁶ = 20002123 is a prime.

Together with 20002189, 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 (20002189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001093 + 10001094.

It is an arithmetic number, because the mean of its divisors is an integer number (10001094).

Almost surely, 2^20002187 is an apocalyptic number.

20002187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002187 is an equidigital number, since it uses as much as digits as its factorization.

20002187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 20002187 is about 4472.3804623489. The cubic root of 20002187 is about 271.4516553511.

Adding to 20002187 its reverse (78120002), we get a palindrome (98122189).

The spelling of 20002187 in words is "twenty million, two thousand, one hundred eighty-seven".