20311878797 has 4 divisors (see below), whose sum is σ = 23213575776. Its totient is φ = 17410181820.

The previous prime is 20311878791. The next prime is 20311878823. The reversal of 20311878797 is 79787811302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20311878797 - 2¹⁴ = 20311862413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311878791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1450848479 + ... + 1450848492.

It is an arithmetic number, because the mean of its divisors is an integer number (5803393944).

Almost surely, 2^20311878797 is an apocalyptic number.

It is an amenable number.

20311878797 is a deficient number, since it is larger than the sum of its proper divisors (2901696979).

20311878797 is an equidigital number, since it uses as much as digits as its factorization.

20311878797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901696978.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 20311878797 in words is "twenty billion, three hundred eleven million, eight hundred seventy-eight thousand, seven hundred ninety-seven".