220168505 has 4 divisors (see below), whose sum is σ = 264202212. Its totient is φ = 176134800.

The previous prime is 220168477. The next prime is 220168549. The reversal of 220168505 is 505861022.

220168505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26708224 + 193460281 = 5168^2 + 13909^2 .

It is not a de Polignac number, because 220168505 - 2⁶ = 220168441 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 22016846 + ... + 22016855.

It is an arithmetic number, because the mean of its divisors is an integer number (66050553).

Almost surely, 2^220168505 is an apocalyptic number.

It is an amenable number.

220168505 is a deficient number, since it is larger than the sum of its proper divisors (44033707).

220168505 is an equidigital number, since it uses as much as digits as its factorization.

220168505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44033706.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 220168505 is about 14838.0761893178. The cubic root of 220168505 is about 603.8351605272.

The spelling of 220168505 in words is "two hundred twenty million, one hundred sixty-eight thousand, five hundred five".