20939496543 has 40 divisors (see below), whose sum is σ = 36714772512. Its totient is φ = 11642025024.

The previous prime is 20939496521. The next prime is 20939496551. The reversal of 20939496543 is 34569493902.

20939496543 is a `hidden beast` number, since 2 + 0 + 9 + 3 + 9 + 4 + 96 + 543 = 666.

It is not a de Polignac number, because 20939496543 - 2⁸ = 20939496287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20939496543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939496563) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 478080 + ... + 520037.

Almost surely, 2^20939496543 is an apocalyptic number.

20939496543 is a deficient number, since it is larger than the sum of its proper divisors (15775275969).

20939496543 is an equidigital number, since it uses as much as digits as its factorization.

20939496543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998173 (or 998164 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 54.

The spelling of 20939496543 in words is "twenty billion, nine hundred thirty-nine million, four hundred ninety-six thousand, five hundred forty-three".