20556116371 has 24 divisors (see below), whose sum is σ = 24900855840. Its totient is φ = 16899120000.

The previous prime is 20556116363. The next prime is 20556116447. The reversal of 20556116371 is 17361165502.

It is not a de Polignac number, because 20556116371 - 2³ = 20556116363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20556116371.

It is not an unprimeable number, because it can be changed into a prime (20556116341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166671 + ... + 262471.

It is an arithmetic number, because the mean of its divisors is an integer number (1037535660).

Almost surely, 2^20556116371 is an apocalyptic number.

20556116371 is a deficient number, since it is larger than the sum of its proper divisors (4344739469).

20556116371 is a wasteful number, since it uses less digits than its factorization.

20556116371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95995 (or 95988 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 20556116371 in words is "twenty billion, five hundred fifty-six million, one hundred sixteen thousand, three hundred seventy-one".