20799256811 has 2 divisors, whose sum is σ = 20799256812. Its totient is φ = 20799256810.

The previous prime is 20799256787. The next prime is 20799256859. The reversal of 20799256811 is 11865299702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20799256811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20799256811.

It is not a weakly prime, because it can be changed into another prime (20799256111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10399628405 + 10399628406.

It is an arithmetic number, because the mean of its divisors is an integer number (10399628406).

Almost surely, 2^20799256811 is an apocalyptic number.

20799256811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20799256811 is an equidigital number, since it uses as much as digits as its factorization.

20799256811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 20799256811 in words is "twenty billion, seven hundred ninety-nine million, two hundred fifty-six thousand, eight hundred eleven".