20804647611 has 8 divisors (see below), whose sum is σ = 30261305664. Its totient is φ = 12608877320.

The previous prime is 20804647609. The next prime is 20804647693. The reversal of 20804647611 is 11674640802.

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

It is a cyclic number.

It is not a de Polignac number, because 20804647611 - 2¹ = 20804647609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20804647611.

It is not an unprimeable number, because it can be changed into a prime (20804647111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315221901 + ... + 315221966.

It is an arithmetic number, because the mean of its divisors is an integer number (3782663208).

Almost surely, 2^20804647611 is an apocalyptic number.

20804647611 is a deficient number, since it is larger than the sum of its proper divisors (9456658053).

20804647611 is a wasteful number, since it uses less digits than its factorization.

20804647611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630443881.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 20804647611 in words is "twenty billion, eight hundred four million, six hundred forty-seven thousand, six hundred eleven".