20320321231 has 8 divisors (see below), whose sum is σ = 23789644704. Its totient is φ = 16992602880.

The previous prime is 20320321213. The next prime is 20320321243. The reversal of 20320321231 is 13212302302.

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 20320321231 - 2⁷ = 20320321103 is a prime.

It is a super-2 number, since 2×20320321231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20320321199 and 20320321208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320321271) 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, 35400970 + ... + 35401543.

It is an arithmetic number, because the mean of its divisors is an integer number (2973705588).

Almost surely, 2^20320321231 is an apocalyptic number.

20320321231 is a deficient number, since it is larger than the sum of its proper divisors (3469323473).

20320321231 is an equidigital number, since it uses as much as digits as its factorization.

20320321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70802561.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20320321231 its reverse (13212302302), we get a palindrome (33532623533).

It can be divided in two parts, 20320 and 321231, that added together give a triangular number (341551 = T₈₂₆).

The spelling of 20320321231 in words is "twenty billion, three hundred twenty million, three hundred twenty-one thousand, two hundred thirty-one".