20187227 has 2 divisors, whose sum is σ = 20187228. Its totient is φ = 20187226.

The previous prime is 20187203. The next prime is 20187229. The reversal of 20187227 is 72278102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20187227 - 2¹⁶ = 20121691 is a prime.

Together with 20187229, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1281773 and since 20187227 and 1281773 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20187227.

It is not a weakly prime, because it can be changed into another prime (20187229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10093613 + 10093614.

It is an arithmetic number, because the mean of its divisors is an integer number (10093614).

Almost surely, 2^20187227 is an apocalyptic number.

20187227 is a deficient number, since it is larger than the sum of its proper divisors (1).

20187227 is an equidigital number, since it uses as much as digits as its factorization.

20187227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20187227 is about 4493.0198085475. The cubic root of 20187227 is about 272.2861526805.

The spelling of 20187227 in words is "twenty million, one hundred eighty-seven thousand, two hundred twenty-seven".