20126827191 has 4 divisors (see below), whose sum is σ = 26835769592. Its totient is φ = 13417884792.

The previous prime is 20126827183. The next prime is 20126827229. The reversal of 20126827191 is 19172862102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20126827191 - 2³ = 20126827183 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 (20126827181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3354471196 + ... + 3354471201.

It is an arithmetic number, because the mean of its divisors is an integer number (6708942398).

Almost surely, 2^20126827191 is an apocalyptic number.

20126827191 is a deficient number, since it is larger than the sum of its proper divisors (6708942401).

20126827191 is an equidigital number, since it uses as much as digits as its factorization.

20126827191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6708942400.

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 20126827191 in words is "twenty billion, one hundred twenty-six million, eight hundred twenty-seven thousand, one hundred ninety-one".