20543903508 has 24 divisors (see below), whose sum is σ = 50019939648. Its totient is φ = 6550230016.

The previous prime is 20543903507. The next prime is 20543903563. The reversal of 20543903508 is 80530934502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543903507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37216941 + ... + 37217492.

It is an arithmetic number, because the mean of its divisors is an integer number (2084164152).

Almost surely, 2^20543903508 is an apocalyptic number.

It is an amenable number.

20543903508 is an abundant number, since it is smaller than the sum of its proper divisors (29476036140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20543903508 is a wasteful number, since it uses less digits than its factorization.

20543903508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74434463 (or 74434461 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 20543903508 in words is "twenty billion, five hundred forty-three million, nine hundred three thousand, five hundred eight".