220172671 has 4 divisors (see below), whose sum is σ = 221029632. Its totient is φ = 219315712.

The previous prime is 220172621. The next prime is 220172707. The reversal of 220172671 is 176271022.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220172671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220172621) 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, 428095 + ... + 428608.

It is an arithmetic number, because the mean of its divisors is an integer number (55257408).

Almost surely, 2^220172671 is an apocalyptic number.

220172671 is a deficient number, since it is larger than the sum of its proper divisors (856961).

220172671 is an equidigital number, since it uses as much as digits as its factorization.

220172671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856960.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 220172671 is about 14838.2165707338. The cubic root of 220172671 is about 603.8389690668.

The spelling of 220172671 in words is "two hundred twenty million, one hundred seventy-two thousand, six hundred seventy-one".