20055571 has 4 divisors (see below), whose sum is σ = 20434032. Its totient is φ = 19677112.

The previous prime is 20055569. The next prime is 20055593. The reversal of 20055571 is 17555002.

It is a happy number.

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 20055571 - 2¹ = 20055569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20053571) 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, 189151 + ... + 189256.

It is an arithmetic number, because the mean of its divisors is an integer number (5108508).

Almost surely, 2^20055571 is an apocalyptic number.

20055571 is a deficient number, since it is larger than the sum of its proper divisors (378461).

20055571 is an equidigital number, since it uses as much as digits as its factorization.

20055571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378460.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 20055571 is about 4478.3446718626. The cubic root of 20055571 is about 271.6929340069.

The spelling of 20055571 in words is "twenty million, fifty-five thousand, five hundred seventy-one".