20555325571 has 4 divisors (see below), whose sum is σ = 22423991544. Its totient is φ = 18686659600.

The previous prime is 20555325551. The next prime is 20555325587. The reversal of 20555325571 is 17552355502.

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 20555325571 - 2⁹ = 20555325059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20555325521) 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, 934332970 + ... + 934332991.

It is an arithmetic number, because the mean of its divisors is an integer number (5605997886).

Almost surely, 2^20555325571 is an apocalyptic number.

20555325571 is a deficient number, since it is larger than the sum of its proper divisors (1868665973).

20555325571 is a wasteful number, since it uses less digits than its factorization.

20555325571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868665972.

The product of its (nonzero) digits is 262500, while the sum is 40.

The spelling of 20555325571 in words is "twenty billion, five hundred fifty-five million, three hundred twenty-five thousand, five hundred seventy-one".