20093597991 has 40 divisors (see below), whose sum is σ = 32029174320. Its totient is φ = 12516778368.

The previous prime is 20093597971. The next prime is 20093597999. The reversal of 20093597991 is 19979539002.

It is not a de Polignac number, because 20093597991 - 2⁵ = 20093597959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20093597999) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22921 + ... + 201773.

It is an arithmetic number, because the mean of its divisors is an integer number (800729358).

Almost surely, 2^20093597991 is an apocalyptic number.

20093597991 is a deficient number, since it is larger than the sum of its proper divisors (11935576329).

20093597991 is a wasteful number, since it uses less digits than its factorization.

20093597991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178957 (or 178948 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 54.

The spelling of 20093597991 in words is "twenty billion, ninety-three million, five hundred ninety-seven thousand, nine hundred ninety-one".