20542205556 has 60 divisors (see below), whose sum is σ = 56036246112. Its totient is φ = 6549686352.

The previous prime is 20542205549. The next prime is 20542205557. The reversal of 20542205556 is 65550224502.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20542205556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542205557) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1370850 + ... + 1385753.

Almost surely, 2^20542205556 is an apocalyptic number.

It is an amenable number.

20542205556 is an abundant number, since it is smaller than the sum of its proper divisors (35494040556).

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

20542205556 is a wasteful number, since it uses less digits than its factorization.

20542205556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756642 (or 2756631 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 20542205556 in words is "twenty billion, five hundred forty-two million, two hundred five thousand, five hundred fifty-six".