20420113322191 has 4 divisors (see below), whose sum is σ = 22276487260584. Its totient is φ = 18563739383800.

The previous prime is 20420113322171. The next prime is 20420113322197. The reversal of 20420113322191 is 19122331102402.

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

It is a cyclic number.

It is not a de Polignac number, because 20420113322191 - 2¹⁷ = 20420113191119 is a prime.

It is a super-2 number, since 2×20420113322191² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420113322197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928186969180 + ... + 928186969201.

It is an arithmetic number, because the mean of its divisors is an integer number (5569121815146).

Almost surely, 2^{20420113322191} is an apocalyptic number.

20420113322191 is a deficient number, since it is larger than the sum of its proper divisors (1856373938393).

20420113322191 is a wasteful number, since it uses less digits than its factorization.

20420113322191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856373938392.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 20420113322191 its reverse (19122331102402), we get a palindrome (39542444424593).

The spelling of 20420113322191 in words is "twenty trillion, four hundred twenty billion, one hundred thirteen million, three hundred twenty-two thousand, one hundred ninety-one".