20542863544 has 16 divisors (see below), whose sum is σ = 44020422000. Its totient is φ = 8804084352.

The previous prime is 20542863521. The next prime is 20542863577. The reversal of 20542863544 is 44536824502.

It is a self number, because there is not a number n which added to its sum of digits gives 20542863544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183418369 + ... + 183418480.

It is an arithmetic number, because the mean of its divisors is an integer number (2751276375).

Almost surely, 2^20542863544 is an apocalyptic number.

It is an amenable number.

20542863544 is an abundant number, since it is smaller than the sum of its proper divisors (23477558456).

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

20542863544 is a wasteful number, since it uses less digits than its factorization.

20542863544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366836862 (or 366836858 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 43.

The spelling of 20542863544 in words is "twenty billion, five hundred forty-two million, eight hundred sixty-three thousand, five hundred forty-four".