20806071 has 24 divisors (see below), whose sum is σ = 32845680. Its totient is φ = 11637120.

The previous prime is 20806069. The next prime is 20806073. The reversal of 20806071 is 17060802.

It is an interprime number because it is at equal distance from previous prime (20806069) and next prime (20806073).

It is not a de Polignac number, because 20806071 - 2¹ = 20806069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806073) 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 23 ways as a sum of consecutive naturals, for example, 2515 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (1368570).

Almost surely, 2^20806071 is an apocalyptic number.

20806071 is a deficient number, since it is larger than the sum of its proper divisors (12039609).

20806071 is a wasteful number, since it uses less digits than its factorization.

20806071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447 (or 4436 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20806071 is about 4561.3672292417. The cubic root of 20806071 is about 275.0405273604.

Adding to 20806071 its reverse (17060802), we get a palindrome (37866873).

The spelling of 20806071 in words is "twenty million, eight hundred six thousand, seventy-one".