20994271191 has 12 divisors (see below), whose sum is σ = 30400687200. Its totient is φ = 13961275200.

The previous prime is 20994271169. The next prime is 20994271219. The reversal of 20994271191 is 19117249902.

It is a happy number.

20994271191 is a `hidden beast` number, since 20 + 99 + 427 + 119 + 1 = 666.

It is not a de Polignac number, because 20994271191 - 2⁶ = 20994271127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994271691) 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, 2904991 + ... + 2912208.

It is an arithmetic number, because the mean of its divisors is an integer number (2533390600).

Almost surely, 2^20994271191 is an apocalyptic number.

20994271191 is a deficient number, since it is larger than the sum of its proper divisors (9406416009).

20994271191 is a wasteful number, since it uses less digits than its factorization.

20994271191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5817606 (or 5817603 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

Adding to 20994271191 its sum of digits (45), we get a square (20994271236 = 144894²).

The spelling of 20994271191 in words is "twenty billion, nine hundred ninety-four million, two hundred seventy-one thousand, one hundred ninety-one".