20651775095809 has 16 divisors (see below), whose sum is σ = 24407508101760. Its totient is φ = 17226387480960.

The previous prime is 20651775095689. The next prime is 20651775095863. The reversal of 20651775095809 is 90859057715602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20651775095809 - 2⁹ = 20651775095297 is a prime.

It is a super-2 number, since 2×20651775095809² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20651775095879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432365364 + ... + 432413125.

It is an arithmetic number, because the mean of its divisors is an integer number (1525469256360).

Almost surely, 2^{20651775095809} is an apocalyptic number.

It is an amenable number.

20651775095809 is a deficient number, since it is larger than the sum of its proper divisors (3755733005951).

20651775095809 is a wasteful number, since it uses less digits than its factorization.

20651775095809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864778680.

The product of its (nonzero) digits is 47628000, while the sum is 64.

The spelling of 20651775095809 in words is "twenty trillion, six hundred fifty-one billion, seven hundred seventy-five million, ninety-five thousand, eight hundred nine".