20013001123 has 4 divisors (see below), whose sum is σ = 20703104640. Its totient is φ = 19322897608.

The previous prime is 20013001097. The next prime is 20013001147. The reversal of 20013001123 is 32110031002.

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-20013001123 is a prime.

It is a super-2 number, since 2×20013001123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20013001153) 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, 345051715 + ... + 345051772.

It is an arithmetic number, because the mean of its divisors is an integer number (5175776160).

Almost surely, 2^20013001123 is an apocalyptic number.

20013001123 is a deficient number, since it is larger than the sum of its proper divisors (690103517).

20013001123 is an equidigital number, since it uses as much as digits as its factorization.

20013001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690103516.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20013001123 its reverse (32110031002), we get a palindrome (52123032125).

The spelling of 20013001123 in words is "twenty billion, thirteen million, one thousand, one hundred twenty-three".