20115071 has 4 divisors (see below), whose sum is σ = 20131944. Its totient is φ = 20098200.

The previous prime is 20115061. The next prime is 20115083. The reversal of 20115071 is 17051102.

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 20115071 - 2¹⁰ = 20114047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6500 + ... + 9081.

It is an arithmetic number, because the mean of its divisors is an integer number (5032986).

Almost surely, 2^20115071 is an apocalyptic number.

20115071 is a deficient number, since it is larger than the sum of its proper divisors (16873).

20115071 is a wasteful number, since it uses less digits than its factorization.

20115071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16872.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 20115071 is about 4484.9828316282. The cubic root of 20115071 is about 271.9613510181.

Adding to 20115071 its reverse (17051102), we get a palindrome (37166173).

The spelling of 20115071 in words is "twenty million, one hundred fifteen thousand, seventy-one".