20306071 has 4 divisors (see below), whose sum is σ = 20592144. Its totient is φ = 20020000.

The previous prime is 20306063. The next prime is 20306113. The reversal of 20306071 is 17060302.

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 20306071 - 2³ = 20306063 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 (20306471) 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, 142930 + ... + 143071.

It is an arithmetic number, because the mean of its divisors is an integer number (5148036).

Almost surely, 2^20306071 is an apocalyptic number.

20306071 is a deficient number, since it is larger than the sum of its proper divisors (286073).

20306071 is an equidigital number, since it uses as much as digits as its factorization.

20306071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286072.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20306071 is about 4506.2258043733. The cubic root of 20306071 is about 272.8194318207.

Adding to 20306071 its reverse (17060302), we get a palindrome (37366373).

The spelling of 20306071 in words is "twenty million, three hundred six thousand, seventy-one".