20423451542113 has 4 divisors (see below), whose sum is σ = 20423501161668. Its totient is φ = 20423401922560.

The previous prime is 20423451542099. The next prime is 20423451542147. The reversal of 20423451542113 is 31124515432402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9732696554529 + 10690754987584 = 3119727^2 + 3269672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20423451542113 is a prime.

It is a super-3 number, since 3×20423451542113³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423451542213) 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, 24187168 + ... + 25017313.

It is an arithmetic number, because the mean of its divisors is an integer number (5105875290417).

Almost surely, 2^{20423451542113} is an apocalyptic number.

It is an amenable number.

20423451542113 is a deficient number, since it is larger than the sum of its proper divisors (49619555).

20423451542113 is an equidigital number, since it uses as much as digits as its factorization.

20423451542113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49619554.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 20423451542113 its reverse (31124515432402), we get a palindrome (51547966974515).

The spelling of 20423451542113 in words is "twenty trillion, four hundred twenty-three billion, four hundred fifty-one million, five hundred forty-two thousand, one hundred thirteen".