20320121231 has 8 divisors (see below), whose sum is σ = 20390436000. Its totient is φ = 20249883360.

The previous prime is 20320121113. The next prime is 20320121249. The reversal of 20320121231 is 13212102302.

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 20320121231 - 2¹⁰ = 20320120207 is a prime.

It is a super-2 number, since 2×20320121231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320121251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537821 + ... + 574361.

It is an arithmetic number, because the mean of its divisors is an integer number (2548804500).

Almost surely, 2^20320121231 is an apocalyptic number.

20320121231 is a deficient number, since it is larger than the sum of its proper divisors (70314769).

20320121231 is a wasteful number, since it uses less digits than its factorization.

20320121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38449.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20320121231 its reverse (13212102302), we get a palindrome (33532223533).

The spelling of 20320121231 in words is "twenty billion, three hundred twenty million, one hundred twenty-one thousand, two hundred thirty-one".