20711171 has 4 divisors (see below), whose sum is σ = 22304352. Its totient is φ = 19117992.

The previous prime is 20711167. The next prime is 20711177. The reversal of 20711171 is 17111702.

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 20711171 - 2² = 20711167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20711177) 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, 796571 + ... + 796596.

It is an arithmetic number, because the mean of its divisors is an integer number (5576088).

Almost surely, 2^20711171 is an apocalyptic number.

20711171 is a deficient number, since it is larger than the sum of its proper divisors (1593181).

20711171 is a wasteful number, since it uses less digits than its factorization.

20711171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593180.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 20711171 is about 4550.9527573905. The cubic root of 20711171 is about 274.6217212160.

Adding to 20711171 its reverse (17111702), we get a palindrome (37822873).

The spelling of 20711171 in words is "twenty million, seven hundred eleven thousand, one hundred seventy-one".