20217227 has 4 divisors (see below), whose sum is σ = 20364936. Its totient is φ = 20069520.

The previous prime is 20217209. The next prime is 20217229. The reversal of 20217227 is 72271202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20217227 - 2⁶ = 20217163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20217229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73649 + ... + 73922.

It is an arithmetic number, because the mean of its divisors is an integer number (5091234).

Almost surely, 2^20217227 is an apocalyptic number.

20217227 is a deficient number, since it is larger than the sum of its proper divisors (147709).

20217227 is a wasteful number, since it uses less digits than its factorization.

20217227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147708.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20217227 is about 4496.3570810157. The cubic root of 20217227 is about 272.4209663345.

Adding to 20217227 its reverse (72271202), we get a palindrome (92488429).

The spelling of 20217227 in words is "twenty million, two hundred seventeen thousand, two hundred twenty-seven".