20963647798811 has 4 divisors (see below), whose sum is σ = 20964331954632. Its totient is φ = 20962963642992.

The previous prime is 20963647798789. The next prime is 20963647798813. The reversal of 20963647798811 is 11889774636902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20963647798811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20963647798813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342031946 + ... + 342093231.

It is an arithmetic number, because the mean of its divisors is an integer number (5241082988658).

Almost surely, 2^{20963647798811} is an apocalyptic number.

20963647798811 is a deficient number, since it is larger than the sum of its proper divisors (684155821).

20963647798811 is an equidigital number, since it uses as much as digits as its factorization.

20963647798811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684155820.

The product of its (nonzero) digits is 219469824, while the sum is 71.

The spelling of 20963647798811 in words is "twenty trillion, nine hundred sixty-three billion, six hundred forty-seven million, seven hundred ninety-eight thousand, eight hundred eleven".