20012543523 has 12 divisors (see below), whose sum is σ = 33036579888. Its totient is φ = 11435739120.

The previous prime is 20012543521. The next prime is 20012543539. The reversal of 20012543523 is 32534521002.

It is a happy number.

20012543523 is a `hidden beast` number, since 200 + 1 + 2 + 5 + 435 + 23 = 666.

It is not a de Polignac number, because 20012543523 - 2¹ = 20012543521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20012543521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158829648 + ... + 158829773.

It is an arithmetic number, because the mean of its divisors is an integer number (2753048324).

Almost surely, 2^20012543523 is an apocalyptic number.

20012543523 is a deficient number, since it is larger than the sum of its proper divisors (13024036365).

20012543523 is a wasteful number, since it uses less digits than its factorization.

20012543523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317659434 (or 317659431 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 20012543523 in words is "twenty billion, twelve million, five hundred forty-three thousand, five hundred twenty-three".