20804473 has 2 divisors, whose sum is σ = 20804474. Its totient is φ = 20804472.

The previous prime is 20804437. The next prime is 20804479. The reversal of 20804473 is 37440802.

Together with previous prime (20804437) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11641744 + 9162729 = 3412^2 + 3027^2 .

It is a cyclic number.

It is not a de Polignac number, because 20804473 - 2⁹ = 20803961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20804479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10402236 + 10402237.

It is an arithmetic number, because the mean of its divisors is an integer number (10402237).

Almost surely, 2^20804473 is an apocalyptic number.

It is an amenable number.

20804473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20804473 is an equidigital number, since it uses as much as digits as its factorization.

20804473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20804473 is about 4561.1920591003. The cubic root of 20804473 is about 275.0334857296.

The spelling of 20804473 in words is "twenty million, eight hundred four thousand, four hundred seventy-three".