20116571 has 4 divisors (see below), whose sum is σ = 20189472. Its totient is φ = 20043672.

The previous prime is 20116543. The next prime is 20116619. The reversal of 20116571 is 17561102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20116571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20116531) 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, 36035 + ... + 36588.

It is an arithmetic number, because the mean of its divisors is an integer number (5047368).

Almost surely, 2^20116571 is an apocalyptic number.

20116571 is a deficient number, since it is larger than the sum of its proper divisors (72901).

20116571 is an equidigital number, since it uses as much as digits as its factorization.

20116571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72900.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 20116571 is about 4485.1500532312. The cubic root of 20116571 is about 271.9681109890.

Adding to 20116571 its reverse (17561102), we get a palindrome (37677673).

The spelling of 20116571 in words is "twenty million, one hundred sixteen thousand, five hundred seventy-one".