220185681 has 8 divisors (see below), whose sum is σ = 294810240. Its totient is φ = 146175792.

The previous prime is 220185677. The next prime is 220185701. The reversal of 220185681 is 186581022.

220185681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220185681 - 2² = 220185677 is a prime.

It is a super-2 number, since 2×220185681² = 96963468234867522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220185611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152830 + ... + 154263.

It is an arithmetic number, because the mean of its divisors is an integer number (36851280).

Almost surely, 2^220185681 is an apocalyptic number.

It is an amenable number.

220185681 is a deficient number, since it is larger than the sum of its proper divisors (74624559).

220185681 is a wasteful number, since it uses less digits than its factorization.

220185681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307335.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 220185681 is about 14838.6549592610. The cubic root of 220185681 is about 603.8508624446.

The spelling of 220185681 in words is "two hundred twenty million, one hundred eighty-five thousand, six hundred eighty-one".