20542055664 has 40 divisors (see below), whose sum is σ = 57149054032. Its totient is φ = 6320632320.

The previous prime is 20542055629. The next prime is 20542055669. The reversal of 20542055664 is 46655024502.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542055669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16459357 + ... + 16460604.

Almost surely, 2^20542055664 is an apocalyptic number.

20542055664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20542055664 is an abundant number, since it is smaller than the sum of its proper divisors (36606998368).

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

20542055664 is a wasteful number, since it uses less digits than its factorization.

20542055664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32919985 (or 32919979 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

Subtracting from 20542055664 its sum of digits (39), we obtain a square (20542055625 = 143325²).

The spelling of 20542055664 in words is "twenty billion, five hundred forty-two million, fifty-five thousand, six hundred sixty-four".