220643461 has 8 divisors (see below), whose sum is σ = 229780224. Its totient is φ = 211632960.

The previous prime is 220643429. The next prime is 220643471. The reversal of 220643461 is 164346022.

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 220643461 - 2⁵ = 220643429 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 (220643471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27991 + ... + 34996.

It is an arithmetic number, because the mean of its divisors is an integer number (28722528).

Almost surely, 2^220643461 is an apocalyptic number.

It is an amenable number.

220643461 is a deficient number, since it is larger than the sum of its proper divisors (9136763).

220643461 is a wasteful number, since it uses less digits than its factorization.

220643461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63131.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 220643461 is about 14854.0722025982. The cubic root of 220643461 is about 604.2690541803.

Adding to 220643461 its reverse (164346022), we get a palindrome (384989483).

The spelling of 220643461 in words is "two hundred twenty million, six hundred forty-three thousand, four hundred sixty-one".