20381940854979 has 32 divisors (see below), whose sum is σ = 29819489969664. Its totient is φ = 12280603342080.

The previous prime is 20381940854969. The next prime is 20381940855041. The reversal of 20381940854979 is 97945804918302.

It is not a de Polignac number, because 20381940854979 - 2⁹ = 20381940854467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20381940854929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113593674 + ... + 113772960.

It is an arithmetic number, because the mean of its divisors is an integer number (931859061552).

Almost surely, 2^{20381940854979} is an apocalyptic number.

20381940854979 is a deficient number, since it is larger than the sum of its proper divisors (9437549114685).

20381940854979 is a wasteful number, since it uses less digits than its factorization.

20381940854979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199387.

The product of its (nonzero) digits is 156764160, while the sum is 69.

The spelling of 20381940854979 in words is "twenty trillion, three hundred eighty-one billion, nine hundred forty million, eight hundred fifty-four thousand, nine hundred seventy-nine".