20612804 has 6 divisors (see below), whose sum is σ = 36072414. Its totient is φ = 10306400.

The previous prime is 20612803. The next prime is 20612819. The reversal of 20612804 is 40821602.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 828100 = 4448^2 + 910^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20612804.

It is not an unprimeable number, because it can be changed into a prime (20612803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2576597 + ... + 2576604.

It is an arithmetic number, because the mean of its divisors is an integer number (6012069).

Almost surely, 2^20612804 is an apocalyptic number.

It is an amenable number.

20612804 is a deficient number, since it is larger than the sum of its proper divisors (15459610).

20612804 is a wasteful number, since it uses less digits than its factorization.

20612804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5153205 (or 5153203 counting only the distinct ones).

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

The square root of 20612804 is about 4540.1325971826. The cubic root of 20612804 is about 274.1862622559.

The spelling of 20612804 in words is "twenty million, six hundred twelve thousand, eight hundred four".