220571681 has 4 divisors (see below), whose sum is σ = 240623664. Its totient is φ = 200519700.

The previous prime is 220571671. The next prime is 220571683. The reversal of 220571681 is 186175022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220571681 - 2¹⁰ = 220570657 is a prime.

It is a super-2 number, since 2×220571681² = 97303732918331522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220571683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10025975 + ... + 10025996.

It is an arithmetic number, because the mean of its divisors is an integer number (60155916).

Almost surely, 2^220571681 is an apocalyptic number.

It is an amenable number.

220571681 is a deficient number, since it is larger than the sum of its proper divisors (20051983).

220571681 is a wasteful number, since it uses less digits than its factorization.

220571681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20051982.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 220571681 is about 14851.6558336099. The cubic root of 220571681 is about 604.2035198912.

The spelling of 220571681 in words is "two hundred twenty million, five hundred seventy-one thousand, six hundred eighty-one".