20431177091 has 12 divisors (see below), whose sum is σ = 22151605392. Its totient is φ = 18835760736.

The previous prime is 20431177073. The next prime is 20431177093. The reversal of 20431177091 is 19077113402.

It is not a de Polignac number, because 20431177091 - 2²² = 20426982787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431177093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58850 + ... + 210536.

It is an arithmetic number, because the mean of its divisors is an integer number (1845967116).

Almost surely, 2^20431177091 is an apocalyptic number.

20431177091 is a deficient number, since it is larger than the sum of its proper divisors (1720428301).

20431177091 is a wasteful number, since it uses less digits than its factorization.

20431177091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152510 (or 152497 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 35.

The spelling of 20431177091 in words is "twenty billion, four hundred thirty-one million, one hundred seventy-seven thousand, ninety-one".