20804336135 has 16 divisors (see below), whose sum is σ = 27970844832. Its totient is φ = 14721494400.

The previous prime is 20804336117. The next prime is 20804336141. The reversal of 20804336135 is 53163340802.

It is not a de Polignac number, because 20804336135 - 2¹² = 20804332039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20804336095 and 20804336104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5109596 + ... + 5113665.

It is an arithmetic number, because the mean of its divisors is an integer number (1748177802).

Almost surely, 2^20804336135 is an apocalyptic number.

20804336135 is a deficient number, since it is larger than the sum of its proper divisors (7166508697).

20804336135 is a wasteful number, since it uses less digits than its factorization.

20804336135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10223314.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 20804336135 its reverse (53163340802), we get a palindrome (73967676937).

The spelling of 20804336135 in words is "twenty billion, eight hundred four million, three hundred thirty-six thousand, one hundred thirty-five".