20331312331 has 8 divisors (see below), whose sum is σ = 22695418944. Its totient is φ = 18053173320.

The previous prime is 20331312329. The next prime is 20331312343. The reversal of 20331312331 is 13321313302.

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

It is not a de Polignac number, because 20331312331 - 2¹ = 20331312329 is a prime.

It is a super-2 number, since 2×20331312331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20331312371) 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, 21491401 + ... + 21492346.

It is an arithmetic number, because the mean of its divisors is an integer number (2836927368).

Almost surely, 2^20331312331 is an apocalyptic number.

20331312331 is a deficient number, since it is larger than the sum of its proper divisors (2364106613).

20331312331 is a wasteful number, since it uses less digits than its factorization.

20331312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42983801.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 20331312331 its reverse (13321313302), we get a palindrome (33652625633).

The spelling of 20331312331 in words is "twenty billion, three hundred thirty-one million, three hundred twelve thousand, three hundred thirty-one".