20475983871 has 16 divisors (see below), whose sum is σ = 34668332800. Its totient is φ = 11700562104.

The previous prime is 20475983791. The next prime is 20475983903. The reversal of 20475983871 is 17838957402.

It is a happy number.

20475983871 is a `hidden beast` number, since 2 + 0 + 47 + 598 + 3 + 8 + 7 + 1 = 666.

It is not a de Polignac number, because 20475983871 - 2³⁰ = 19402242047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475983371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54169081 + ... + 54169458.

It is an arithmetic number, because the mean of its divisors is an integer number (2166770800).

Almost surely, 2^20475983871 is an apocalyptic number.

20475983871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20475983871 is a deficient number, since it is larger than the sum of its proper divisors (14192348929).

20475983871 is a wasteful number, since it uses less digits than its factorization.

20475983871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108338555 (or 108338549 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 20475983871 in words is "twenty billion, four hundred seventy-five million, nine hundred eighty-three thousand, eight hundred seventy-one".