20399836951191 has 16 divisors (see below), whose sum is σ = 27330047103744. Its totient is φ = 13534804847424.

The previous prime is 20399836951163. The next prime is 20399836951211. The reversal of 20399836951191 is 19115963899302.

It is not a de Polignac number, because 20399836951191 - 2⁷ = 20399836951063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20399836951121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3941115 + ... + 7505468.

It is an arithmetic number, because the mean of its divisors is an integer number (1708127943984).

Almost surely, 2^{20399836951191} is an apocalyptic number.

20399836951191 is a deficient number, since it is larger than the sum of its proper divisors (6930210152553).

20399836951191 is a wasteful number, since it uses less digits than its factorization.

20399836951191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11449430.

The product of its (nonzero) digits is 28343520, while the sum is 66.

The spelling of 20399836951191 in words is "twenty trillion, three hundred ninety-nine billion, eight hundred thirty-six million, nine hundred fifty-one thousand, one hundred ninety-one".