20804306 has 4 divisors (see below), whose sum is σ = 31206462. Its totient is φ = 10402152.

The previous prime is 20804299. The next prime is 20804309. The reversal of 20804306 is 60340802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60340802 = 2 ⋅30170401.

It can be written as a sum of positive squares in only one way, i.e., 12538681 + 8265625 = 3541^2 + 2875^2 .

It is not an unprimeable number, because it can be changed into a prime (20804309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5201075 + ... + 5201078.

Almost surely, 2^20804306 is an apocalyptic number.

20804306 is a deficient number, since it is larger than the sum of its proper divisors (10402156).

20804306 is a wasteful number, since it uses less digits than its factorization.

20804306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402155.

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

The square root of 20804306 is about 4561.1737524457. The cubic root of 20804306 is about 275.0327498187.

The spelling of 20804306 in words is "twenty million, eight hundred four thousand, three hundred six".