220644173 has 4 divisors (see below), whose sum is σ = 233623260. Its totient is φ = 207665088.

The previous prime is 220644163. The next prime is 220644187. The reversal of 220644173 is 371446022.

220644173 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 93450889 + 127193284 = 9667^2 + 11278^2 .

It is a cyclic number.

It is not a de Polignac number, because 220644173 - 2¹⁶ = 220578637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220644103) 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, 6489518 + ... + 6489551.

It is an arithmetic number, because the mean of its divisors is an integer number (58405815).

Almost surely, 2^220644173 is an apocalyptic number.

It is an amenable number.

220644173 is a deficient number, since it is larger than the sum of its proper divisors (12979087).

220644173 is a wasteful number, since it uses less digits than its factorization.

220644173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12979086.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 220644173 is about 14854.0961690707. The cubic root of 220644173 is about 604.2697041567.

The spelling of 220644173 in words is "two hundred twenty million, six hundred forty-four thousand, one hundred seventy-three".