20520364543 has 4 divisors (see below), whose sum is σ = 23451845200. Its totient is φ = 17588883888.

The previous prime is 20520364531. The next prime is 20520364561. The reversal of 20520364543 is 34546302502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34546302502 = 2 ⋅17273151251.

It is a cyclic number.

It is not a de Polignac number, because 20520364543 - 2⁵ = 20520364511 is a prime.

It is a super-2 number, since 2×20520364543² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20520364499 and 20520364508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520304543) 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, 1465740318 + ... + 1465740331.

It is an arithmetic number, because the mean of its divisors is an integer number (5862961300).

Almost surely, 2^20520364543 is an apocalyptic number.

20520364543 is a deficient number, since it is larger than the sum of its proper divisors (2931480657).

20520364543 is an equidigital number, since it uses as much as digits as its factorization.

20520364543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931480656.

The product of its (nonzero) digits is 86400, while the sum is 34.

The spelling of 20520364543 in words is "twenty billion, five hundred twenty million, three hundred sixty-four thousand, five hundred forty-three".