20543543544 has 32 divisors (see below), whose sum is σ = 51362824320. Its totient is φ = 6847319136.

The previous prime is 20543543491. The next prime is 20543543557. The reversal of 20543543544 is 44534534502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400189 + ... + 448595.

It is an arithmetic number, because the mean of its divisors is an integer number (1605088260).

Almost surely, 2^20543543544 is an apocalyptic number.

20543543544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20543543544 is an abundant number, since it is smaller than the sum of its proper divisors (30819280776).

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

20543543544 is a wasteful number, since it uses less digits than its factorization.

20543543544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66099 (or 66095 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 39.

The spelling of 20543543544 in words is "twenty billion, five hundred forty-three million, five hundred forty-three thousand, five hundred forty-four".