20812541759 has 4 divisors (see below), whose sum is σ = 20813151216. Its totient is φ = 20811932304.

The previous prime is 20812541753. The next prime is 20812541807. The reversal of 20812541759 is 95714521802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95714521802 = 2 ⋅47857260901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20812541759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20812541753) 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 3 ways as a sum of consecutive naturals, for example, 250259 + ... + 322884.

It is an arithmetic number, because the mean of its divisors is an integer number (5203287804).

Almost surely, 2^20812541759 is an apocalyptic number.

20812541759 is a deficient number, since it is larger than the sum of its proper divisors (609457).

20812541759 is an equidigital number, since it uses as much as digits as its factorization.

20812541759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609456.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 20812541759 in words is "twenty billion, eight hundred twelve million, five hundred forty-one thousand, seven hundred fifty-nine".