20804065 has 8 divisors (see below), whose sum is σ = 25316928. Its totient is φ = 16408560.

The previous prime is 20804059. The next prime is 20804087. The reversal of 20804065 is 56040802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20804065 - 2⁹ = 20803553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28947 + ... + 29656.

It is an arithmetic number, because the mean of its divisors is an integer number (3164616).

Almost surely, 2^20804065 is an apocalyptic number.

It is an amenable number.

20804065 is a deficient number, since it is larger than the sum of its proper divisors (4512863).

20804065 is an equidigital number, since it uses as much as digits as its factorization.

20804065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58679.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20804065 is about 4561.1473337308. The cubic root of 20804065 is about 275.0316878086.

Adding to 20804065 its reverse (56040802), we get a palindrome (76844867).

It can be divided in two parts, 208040 and 65, that multiplied together give a triangular number (13522600 = T₅₂₀₀).

The spelling of 20804065 in words is "twenty million, eight hundred four thousand, sixty-five".