220856866 has 8 divisors (see below), whose sum is σ = 342709020. Its totient is φ = 106620528.

The previous prime is 220856861. The next prime is 220856887. The reversal of 220856866 is 668658022.

It can be written as a sum of positive squares in 2 ways, for example, as 210105025 + 10751841 = 14495^2 + 3279^2 .

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

It is not an unprimeable number, because it can be changed into a prime (220856861) 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, 1903881 + ... + 1903996.

Almost surely, 2^220856866 is an apocalyptic number.

220856866 is a deficient number, since it is larger than the sum of its proper divisors (121852154).

220856866 is a wasteful number, since it uses less digits than its factorization.

220856866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807908.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 220856866 is about 14861.2538501972. The cubic root of 220856866 is about 604.4638065117.

The spelling of 220856866 in words is "two hundred twenty million, eight hundred fifty-six thousand, eight hundred sixty-six".