220661312 has 28 divisors (see below), whose sum is σ = 438447180. Its totient is φ = 110186496.

The previous prime is 220661281. The next prime is 220661347. The reversal of 220661312 is 213166022.

220661312 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 116294656 + 104366656 = 10784^2 + 10216^2 .

It is a super-2 number, since 2×220661312² = 97382829227122688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60764 + ... + 64292.

Almost surely, 2^220661312 is an apocalyptic number.

It is an amenable number.

220661312 is a deficient number, since it is larger than the sum of its proper divisors (217785868).

220661312 is an equidigital number, since it uses as much as digits as its factorization.

220661312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518 (or 4508 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 220661312 is about 14854.6730694418. The cubic root of 220661312 is about 604.2853497248.

The spelling of 220661312 in words is "two hundred twenty million, six hundred sixty-one thousand, three hundred twelve".