20018227 has 2 divisors, whose sum is σ = 20018228. Its totient is φ = 20018226.

The previous prime is 20018171. The next prime is 20018239. The reversal of 20018227 is 72281002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20018227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20018198 and 20018207.

It is not a weakly prime, because it can be changed into another prime (20018527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009113 + 10009114.

It is an arithmetic number, because the mean of its divisors is an integer number (10009114).

Almost surely, 2^20018227 is an apocalyptic number.

20018227 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018227 is an equidigital number, since it uses as much as digits as its factorization.

20018227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20018227 is about 4474.1733314658. The cubic root of 20018227 is about 271.5241961055.

Adding to 20018227 its reverse (72281002), we get a palindrome (92299229).

The spelling of 20018227 in words is "twenty million, eighteen thousand, two hundred twenty-seven".