20013657720011 has 4 divisors (see below), whose sum is σ = 20501795713224. Its totient is φ = 19525519726800.

The previous prime is 20013657719987. The next prime is 20013657720019. The reversal of 20013657720011 is 11002775631002.

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 20013657720011 - 2²² = 20013653525707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013657720019) 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, 244068996545 + ... + 244068996626.

It is an arithmetic number, because the mean of its divisors is an integer number (5125448928306).

Almost surely, 2^{20013657720011} is an apocalyptic number.

20013657720011 is a deficient number, since it is larger than the sum of its proper divisors (488137993213).

20013657720011 is an equidigital number, since it uses as much as digits as its factorization.

20013657720011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488137993212.

The product of its (nonzero) digits is 17640, while the sum is 35.

The spelling of 20013657720011 in words is "twenty trillion, thirteen billion, six hundred fifty-seven million, seven hundred twenty thousand, eleven".