20987207176 has 16 divisors (see below), whose sum is σ = 42378014700. Its totient is φ = 9686403264.

The previous prime is 20987207077. The next prime is 20987207191. The reversal of 20987207176 is 67170278902.

It can be written as a sum of positive squares in 2 ways, for example, as 20923622500 + 63584676 = 144650^2 + 7974^2 .

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, 100899931 + ... + 100900138.

Almost surely, 2^20987207176 is an apocalyptic number.

20987207176 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20987207176 is an abundant number, since it is smaller than the sum of its proper divisors (21390807524).

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

20987207176 is a wasteful number, since it uses less digits than its factorization.

20987207176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201800088 (or 201800084 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 49.

The spelling of 20987207176 in words is "twenty billion, nine hundred eighty-seven million, two hundred seven thousand, one hundred seventy-six".