220685761 has 4 divisors (see below), whose sum is σ = 225818032. Its totient is φ = 215553492.

The previous prime is 220685719. The next prime is 220685791. The reversal of 220685761 is 167586022.

It is a happy number.

220685761 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167586022 = 2 ⋅83793011.

It is a cyclic number.

It is not a de Polignac number, because 220685761 - 2¹¹ = 220683713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220685761.

It is not an unprimeable number, because it can be changed into a prime (220685711) 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, 2566071 + ... + 2566156.

It is an arithmetic number, because the mean of its divisors is an integer number (56454508).

Almost surely, 2^220685761 is an apocalyptic number.

It is an amenable number.

220685761 is a deficient number, since it is larger than the sum of its proper divisors (5132271).

220685761 is an equidigital number, since it uses as much as digits as its factorization.

220685761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132270.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 220685761 is about 14855.4959863345. The cubic root of 220685761 is about 604.3076669233.

The spelling of 220685761 in words is "two hundred twenty million, six hundred eighty-five thousand, seven hundred sixty-one".