220531685 has 8 divisors (see below), whose sum is σ = 288696096. Its totient is φ = 160386640.

The previous prime is 220531657. The next prime is 220531691. The reversal of 220531685 is 586135022.

220531685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-220531685 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, 2004779 + ... + 2004888.

It is an arithmetic number, because the mean of its divisors is an integer number (36087012).

Almost surely, 2^220531685 is an apocalyptic number.

It is an amenable number.

220531685 is a deficient number, since it is larger than the sum of its proper divisors (68164411).

220531685 is a wasteful number, since it uses less digits than its factorization.

220531685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009683.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 220531685 is about 14850.3092560391. The cubic root of 220531685 is about 604.1669978489.

The spelling of 220531685 in words is "two hundred twenty million, five hundred thirty-one thousand, six hundred eighty-five".