20504065 has 4 divisors (see below), whose sum is σ = 24604884. Its totient is φ = 16403248.

The previous prime is 20504053. The next prime is 20504101. The reversal of 20504065 is 56040502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13749264 + 6754801 = 3708^2 + 2599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504065 - 2⁷ = 20503937 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

20504065 is a modest number, since divided by 4065 gives 205 as remainder.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2050402 + ... + 2050411.

It is an arithmetic number, because the mean of its divisors is an integer number (6151221).

Almost surely, 2^20504065 is an apocalyptic number.

It is an amenable number.

20504065 is a deficient number, since it is larger than the sum of its proper divisors (4100819).

20504065 is an equidigital number, since it uses as much as digits as its factorization.

20504065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100818.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20504065 is about 4528.1414509708. The cubic root of 20504065 is about 273.7032724675.

Adding to 20504065 its reverse (56040502), we get a palindrome (76544567).

The spelling of 20504065 in words is "twenty million, five hundred four thousand, sixty-five".