20543545311 has 4 divisors (see below), whose sum is σ = 27391393752. Its totient is φ = 13695696872.

The previous prime is 20543545303. The next prime is 20543545327. The reversal of 20543545311 is 11354534502.

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

It is a cyclic number.

It is not a de Polignac number, because 20543545311 - 2³ = 20543545303 is a prime.

It is a super-2 number, since 2×20543545311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543545381) 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 in 3 ways as a sum of consecutive naturals, for example, 3423924216 + ... + 3423924221.

It is an arithmetic number, because the mean of its divisors is an integer number (6847848438).

Almost surely, 2^20543545311 is an apocalyptic number.

20543545311 is a deficient number, since it is larger than the sum of its proper divisors (6847848441).

20543545311 is an equidigital number, since it uses as much as digits as its factorization.

20543545311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6847848440.

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 20543545311 in words is "twenty billion, five hundred forty-three million, five hundred forty-five thousand, three hundred eleven".