20512245543 has 16 divisors (see below), whose sum is σ = 28961491680. Its totient is φ = 12869083136.

The previous prime is 20512245529. The next prime is 20512245583. The reversal of 20512245543 is 34554221502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20512245543 - 2²⁰ = 20511196967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512245583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736903 + ... + 764231.

It is an arithmetic number, because the mean of its divisors is an integer number (1810093230).

Almost surely, 2^20512245543 is an apocalyptic number.

20512245543 is a deficient number, since it is larger than the sum of its proper divisors (8449246137).

20512245543 is a wasteful number, since it uses less digits than its factorization.

20512245543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42066.

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 20512245543 in words is "twenty billion, five hundred twelve million, two hundred forty-five thousand, five hundred forty-three".