20804066 has 4 divisors (see below), whose sum is σ = 31206102. Its totient is φ = 10402032.

The previous prime is 20804059. The next prime is 20804087. The reversal of 20804066 is 66040802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 4116841 = 4085^2 + 2029^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5201015 + ... + 5201018.

Almost surely, 2^20804066 is an apocalyptic number.

20804066 is a deficient number, since it is larger than the sum of its proper divisors (10402036).

20804066 is a wasteful number, since it uses less digits than its factorization.

20804066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402035.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20804066 is about 4561.1474433524. The cubic root of 20804066 is about 275.0316922153.

Adding to 20804066 its reverse (66040802), we get a palindrome (86844868).

The spelling of 20804066 in words is "twenty million, eight hundred four thousand, sixty-six".