20131331511 has 8 divisors (see below), whose sum is σ = 26850421360. Its totient is φ = 13416564672.

The previous prime is 20131331503. The next prime is 20131331513. The reversal of 20131331511 is 11513313102.

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

It is not a de Polignac number, because 20131331511 - 2³ = 20131331503 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 (20131331513) 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, 1069870 + ... + 1088523.

It is an arithmetic number, because the mean of its divisors is an integer number (3356302670).

Almost surely, 2^20131331511 is an apocalyptic number.

20131331511 is a deficient number, since it is larger than the sum of its proper divisors (6719089849).

20131331511 is a wasteful number, since it uses less digits than its factorization.

20131331511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161505.

The product of its (nonzero) digits is 270, while the sum is 21.

Adding to 20131331511 its reverse (11513313102), we get a palindrome (31644644613).

The spelling of 20131331511 in words is "twenty billion, one hundred thirty-one million, three hundred thirty-one thousand, five hundred eleven".