20607397191 has 20 divisors (see below), whose sum is σ = 31173568800. Its totient is φ = 13564358496.

The previous prime is 20607397159. The next prime is 20607397241. The reversal of 20607397191 is 19179370602.

20607397191 is a `hidden beast` number, since 2 + 0 + 607 + 39 + 7 + 1 + 9 + 1 = 666.

It is not a de Polignac number, because 20607397191 - 2⁵ = 20607397159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20607396191) 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 19 ways as a sum of consecutive naturals, for example, 1603806 + ... + 1616603.

It is an arithmetic number, because the mean of its divisors is an integer number (1558678440).

Almost surely, 2^20607397191 is an apocalyptic number.

20607397191 is a deficient number, since it is larger than the sum of its proper divisors (10566171609).

20607397191 is an equidigital number, since it uses as much as digits as its factorization.

20607397191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220500 (or 3220491 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The spelling of 20607397191 in words is "twenty billion, six hundred seven million, three hundred ninety-seven thousand, one hundred ninety-one".