20571067 has 4 divisors (see below), whose sum is σ = 22441176. Its totient is φ = 18700960.

The previous prime is 20571041. The next prime is 20571119. The reversal of 20571067 is 76017502.

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-20571067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20571017) 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, 935038 + ... + 935059.

It is an arithmetic number, because the mean of its divisors is an integer number (5610294).

Almost surely, 2^20571067 is an apocalyptic number.

20571067 is a deficient number, since it is larger than the sum of its proper divisors (1870109).

20571067 is a wasteful number, since it uses less digits than its factorization.

20571067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870108.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 20571067 is about 4535.5338164322. The cubic root of 20571067 is about 274.0010789025.

Adding to 20571067 its reverse (76017502), we get a palindrome (96588569).

The spelling of 20571067 in words is "twenty million, five hundred seventy-one thousand, sixty-seven".