20431534514191 has 4 divisors (see below), whose sum is σ = 21633389485632. Its totient is φ = 19229679542752.

The previous prime is 20431534514173. The next prime is 20431534514201. The reversal of 20431534514191 is 19141543513402.

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 20431534514191 - 2¹¹ = 20431534512143 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 (20431534514101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600927485695 + ... + 600927485728.

It is an arithmetic number, because the mean of its divisors is an integer number (5408347371408).

Almost surely, 2^{20431534514191} is an apocalyptic number.

20431534514191 is a deficient number, since it is larger than the sum of its proper divisors (1201854971441).

20431534514191 is a wasteful number, since it uses less digits than its factorization.

20431534514191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201854971440.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 20431534514191 in words is "twenty trillion, four hundred thirty-one billion, five hundred thirty-four million, five hundred fourteen thousand, one hundred ninety-one".