20311311767 has 4 divisors (see below), whose sum is σ = 20313117216. Its totient is φ = 20309506320.

The previous prime is 20311311721. The next prime is 20311311773. The reversal of 20311311767 is 76711311302.

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 20311311767 - 2¹² = 20311307671 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 (20311311067) 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 3 ways as a sum of consecutive naturals, for example, 885743 + ... + 908384.

It is an arithmetic number, because the mean of its divisors is an integer number (5078279304).

Almost surely, 2^20311311767 is an apocalyptic number.

20311311767 is a deficient number, since it is larger than the sum of its proper divisors (1805449).

20311311767 is a wasteful number, since it uses less digits than its factorization.

20311311767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805448.

The product of its (nonzero) digits is 5292, while the sum is 32.

The spelling of 20311311767 in words is "twenty billion, three hundred eleven million, three hundred eleven thousand, seven hundred sixty-seven".