20196571 has 4 divisors (see below), whose sum is σ = 20385432. Its totient is φ = 20007712.

The previous prime is 20196529. The next prime is 20196577. The reversal of 20196571 is 17569102.

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 20196571 - 2⁷ = 20196443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20196577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94270 + ... + 94483.

It is an arithmetic number, because the mean of its divisors is an integer number (5096358).

Almost surely, 2^20196571 is an apocalyptic number.

20196571 is a deficient number, since it is larger than the sum of its proper divisors (188861).

20196571 is a wasteful number, since it uses less digits than its factorization.

20196571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188860.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 20196571 is about 4494.0595234153. The cubic root of 20196571 is about 272.3281569532.

The spelling of 20196571 in words is "twenty million, one hundred ninety-six thousand, five hundred seventy-one".