20705227 has 4 divisors (see below), whose sum is σ = 20937960. Its totient is φ = 20472496.

The previous prime is 20705203. The next prime is 20705261. The reversal of 20705227 is 72250702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20705227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20705827) 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, 116233 + ... + 116410.

It is an arithmetic number, because the mean of its divisors is an integer number (5234490).

Almost surely, 2^20705227 is an apocalyptic number.

20705227 is a deficient number, since it is larger than the sum of its proper divisors (232733).

20705227 is an equidigital number, since it uses as much as digits as its factorization.

20705227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232732.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20705227 is about 4550.2996604619. The cubic root of 20705227 is about 274.5954470265.

Adding to 20705227 its reverse (72250702), we get a palindrome (92955929).

The spelling of 20705227 in words is "twenty million, seven hundred five thousand, two hundred twenty-seven".