20745227 has 4 divisors (see below), whose sum is σ = 20766720. Its totient is φ = 20723736.

The previous prime is 20745217. The next prime is 20745233. The reversal of 20745227 is 72254702.

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 20745227 - 2⁴ = 20745211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20745227.

It is not an unprimeable number, because it can be changed into a prime (20745217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9227 + ... + 11252.

It is an arithmetic number, because the mean of its divisors is an integer number (5191680).

Almost surely, 2^20745227 is an apocalyptic number.

20745227 is a deficient number, since it is larger than the sum of its proper divisors (21493).

20745227 is a wasteful number, since it uses less digits than its factorization.

20745227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21492.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 20745227 is about 4554.6928546281. The cubic root of 20745227 is about 274.7721617007.

Adding to 20745227 its reverse (72254702), we get a palindrome (92999929).

The spelling of 20745227 in words is "twenty million, seven hundred forty-five thousand, two hundred twenty-seven".