20505227 has 2 divisors, whose sum is σ = 20505228. Its totient is φ = 20505226.

The previous prime is 20505217. The next prime is 20505239. The reversal of 20505227 is 72250502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20505227 - 2¹⁰ = 20504203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20505217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252613 + 10252614.

It is an arithmetic number, because the mean of its divisors is an integer number (10252614).

Almost surely, 2^20505227 is an apocalyptic number.

20505227 is a deficient number, since it is larger than the sum of its proper divisors (1).

20505227 is an equidigital number, since it uses as much as digits as its factorization.

20505227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 20505227 is about 4528.2697578656. The cubic root of 20505227 is about 273.7084427787.

Adding to 20505227 its reverse (72250502), we get a palindrome (92755729).

The spelling of 20505227 in words is "twenty million, five hundred five thousand, two hundred twenty-seven".