20551192511872 has 64 divisors (see below), whose sum is σ = 45870943476240. Its totient is φ = 9088979466240.

The previous prime is 20551192511867. The next prime is 20551192511879. The reversal of 20551192511872 is 27811529115502.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551192511879) 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, 197191383 + ... + 197295574.

Almost surely, 2^{20551192511872} is an apocalyptic number.

20551192511872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20551192511872 is an abundant number, since it is smaller than the sum of its proper divisors (25319750964368).

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

20551192511872 is a wasteful number, since it uses less digits than its factorization.

20551192511872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394487019 (or 394487007 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 49.

The spelling of 20551192511872 in words is "twenty trillion, five hundred fifty-one billion, one hundred ninety-two million, five hundred eleven thousand, eight hundred seventy-two".