20604218 has 8 divisors (see below), whose sum is σ = 30939348. Its totient is φ = 10291104.

The previous prime is 20604211. The next prime is 20604247. The reversal of 20604218 is 81240602.

It can be written as a sum of positive squares in 2 ways, for example, as 20457529 + 146689 = 4523^2 + 383^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20604193 and 20604202.

It is not an unprimeable number, because it can be changed into a prime (20604211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2921 + ... + 7052.

Almost surely, 2^20604218 is an apocalyptic number.

20604218 is a deficient number, since it is larger than the sum of its proper divisors (10335130).

20604218 is a wasteful number, since it uses less digits than its factorization.

20604218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11008.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20604218 is about 4539.1869315991. The cubic root of 20604218 is about 274.1481873747.

The spelling of 20604218 in words is "twenty million, six hundred four thousand, two hundred eighteen".