220804605 has 96 divisors (see below), whose sum is σ = 467251200. Its totient is φ = 94214016.

The previous prime is 220804603. The next prime is 220804627. The reversal of 220804605 is 506408022.

220804605 is a nontrivial binomial coefficient, being equal to C(21015, 2).

It is not a de Polignac number, because 220804605 - 2¹ = 220804603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220804603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 472582 + ... + 473048.

It is an arithmetic number, because the mean of its divisors is an integer number (4867200).

Almost surely, 2^220804605 is an apocalyptic number.

220804605 is the 21014-th triangular number.

It is an amenable number.

220804605 is an abundant number, since it is smaller than the sum of its proper divisors (246446595).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220804605 is a wasteful number, since it uses less digits than its factorization.

220804605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 220804605 is about 14859.4954490386. The cubic root of 220804605 is about 604.4161249890.

The spelling of 220804605 in words is "two hundred twenty million, eight hundred four thousand, six hundred five".