20311171311 has 8 divisors (see below), whose sum is σ = 28674594864. Its totient is φ = 12744264320.

The previous prime is 20311171253. The next prime is 20311171333. The reversal of 20311171311 is 11317111302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20311171311 - 2⁷ = 20311171183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311171381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199129080 + ... + 199129181.

It is an arithmetic number, because the mean of its divisors is an integer number (3584324358).

Almost surely, 2^20311171311 is an apocalyptic number.

20311171311 is a deficient number, since it is larger than the sum of its proper divisors (8363423553).

20311171311 is a wasteful number, since it uses less digits than its factorization.

20311171311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398258281.

The product of its (nonzero) digits is 126, while the sum is 21.

Adding to 20311171311 its reverse (11317111302), we get a palindrome (31628282613).

The spelling of 20311171311 in words is "twenty billion, three hundred eleven million, one hundred seventy-one thousand, three hundred eleven".