20306871 has 30 divisors (see below), whose sum is σ = 32178640. Its totient is φ = 12338352.

The previous prime is 20306837. The next prime is 20306887. The reversal of 20306871 is 17860302.

It is not a de Polignac number, because 20306871 - 2⁶ = 20306807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20306831) 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 29 ways as a sum of consecutive naturals, for example, 257010 + ... + 257088.

Almost surely, 2^20306871 is an apocalyptic number.

20306871 is a deficient number, since it is larger than the sum of its proper divisors (11871769).

20306871 is an frugal number, since it uses more digits than its factorization.

20306871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20306871 is about 4506.3145695790. The cubic root of 20306871 is about 272.8230145371.

The spelling of 20306871 in words is "twenty million, three hundred six thousand, eight hundred seventy-one".