20321312331 has 8 divisors (see below), whose sum is σ = 27136578960. Its totient is φ = 13526793632.

The previous prime is 20321312329. The next prime is 20321312351. The reversal of 20321312331 is 13321312302.

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 20321312331 - 2¹ = 20321312329 is a prime.

It is a super-2 number, since 2×20321312331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20321312298 and 20321312307.

It is not an unprimeable number, because it can be changed into a prime (20321312351) 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, 5184696 + ... + 5188613.

It is an arithmetic number, because the mean of its divisors is an integer number (3392072370).

Almost surely, 2^20321312331 is an apocalyptic number.

20321312331 is a deficient number, since it is larger than the sum of its proper divisors (6815266629).

20321312331 is a wasteful number, since it uses less digits than its factorization.

20321312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10373965.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20321312331 its reverse (13321312302), we get a palindrome (33642624633).

The spelling of 20321312331 in words is "twenty billion, three hundred twenty-one million, three hundred twelve thousand, three hundred thirty-one".