220187845 has 8 divisors (see below), whose sum is σ = 266564376. Its totient is φ = 174590976.

The previous prime is 220187819. The next prime is 220187873. The reversal of 220187845 is 548781022.

It can be written as a sum of positive squares in 4 ways, for example, as 3568321 + 216619524 = 1889^2 + 14718^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 220187845 - 2¹⁵ = 220155077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194292 + ... + 195421.

It is an arithmetic number, because the mean of its divisors is an integer number (33320547).

Almost surely, 2^220187845 is an apocalyptic number.

It is an amenable number.

220187845 is a deficient number, since it is larger than the sum of its proper divisors (46376531).

220187845 is a wasteful number, since it uses less digits than its factorization.

220187845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389831.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 220187845 is about 14838.7278767420. The cubic root of 220187845 is about 603.8528406674.

The spelling of 220187845 in words is "two hundred twenty million, one hundred eighty-seven thousand, eight hundred forty-five".