220204661 has 4 divisors (see below), whose sum is σ = 231794400. Its totient is φ = 208614924.

The previous prime is 220204657. The next prime is 220204669. The reversal of 220204661 is 166402022.

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.

It is a cyclic number.

It is not a de Polignac number, because 220204661 - 2² = 220204657 is a prime.

It is a super-2 number, since 2×220204661² = 96980185452249842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220204669) 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, 5794841 + ... + 5794878.

It is an arithmetic number, because the mean of its divisors is an integer number (57948600).

Almost surely, 2^220204661 is an apocalyptic number.

It is an amenable number.

220204661 is a deficient number, since it is larger than the sum of its proper divisors (11589739).

220204661 is a wasteful number, since it uses less digits than its factorization.

220204661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11589738.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 220204661 is about 14839.2944913160. The cubic root of 220204661 is about 603.8682125890.

Adding to 220204661 its reverse (166402022), we get a palindrome (386606683).

The spelling of 220204661 in words is "two hundred twenty million, two hundred four thousand, six hundred sixty-one".