20540654069991 has 64 divisors (see below), whose sum is σ = 31772667902976. Its totient is φ = 11665553817600.

The previous prime is 20540654069987. The next prime is 20540654070031. The reversal of 20540654069991 is 19996045604502.

It is not a de Polignac number, because 20540654069991 - 2² = 20540654069987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540654069981) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 801323511 + ... + 801349143.

It is an arithmetic number, because the mean of its divisors is an integer number (496447935984).

Almost surely, 2^{20540654069991} is an apocalyptic number.

20540654069991 is a deficient number, since it is larger than the sum of its proper divisors (11232013832985).

20540654069991 is a wasteful number, since it uses less digits than its factorization.

20540654069991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31832.

The product of its (nonzero) digits is 20995200, while the sum is 60.

The spelling of 20540654069991 in words is "twenty trillion, five hundred forty billion, six hundred fifty-four million, sixty-nine thousand, nine hundred ninety-one".