20320121123 has 4 divisors (see below), whose sum is σ = 20328803568. Its totient is φ = 20311438680.

The previous prime is 20320121113. The next prime is 20320121249. The reversal of 20320121123 is 32112102302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320121123 is a prime.

It is a super-2 number, since 2×20320121123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320121113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4337711 + ... + 4342392.

It is an arithmetic number, because the mean of its divisors is an integer number (5082200892).

Almost surely, 2^20320121123 is an apocalyptic number.

20320121123 is a deficient number, since it is larger than the sum of its proper divisors (8682445).

20320121123 is an equidigital number, since it uses as much as digits as its factorization.

20320121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8682444.

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

Adding to 20320121123 its reverse (32112102302), we get a palindrome (52432223425).

The spelling of 20320121123 in words is "twenty billion, three hundred twenty million, one hundred twenty-one thousand, one hundred twenty-three".