20311979950079 has 4 divisors (see below), whose sum is σ = 20598064174800. Its totient is φ = 20025895725360.

The previous prime is 20311979950027. The next prime is 20311979950139. The reversal of 20311979950079 is 97005997911302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311979950079 is a prime.

It is a super-2 number, since 2×20311979950079² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311979950019) 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, 143042112254 + ... + 143042112395.

It is an arithmetic number, because the mean of its divisors is an integer number (5149516043700).

Almost surely, 2^{20311979950079} is an apocalyptic number.

20311979950079 is a deficient number, since it is larger than the sum of its proper divisors (286084224721).

20311979950079 is an equidigital number, since it uses as much as digits as its factorization.

20311979950079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286084224720.

The product of its (nonzero) digits is 9644670, while the sum is 62.

The spelling of 20311979950079 in words is "twenty trillion, three hundred eleven billion, nine hundred seventy-nine million, nine hundred fifty thousand, seventy-nine".