20013127515443 has 4 divisors (see below), whose sum is σ = 20013463856568. Its totient is φ = 20012791174320.

The previous prime is 20013127515439. The next prime is 20013127515449. The reversal of 20013127515443 is 34451572131002.

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

It is a cyclic number.

It is not a de Polignac number, because 20013127515443 - 2² = 20013127515439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013127515397 and 20013127515406.

It is not an unprimeable number, because it can be changed into a prime (20013127515449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168081293 + ... + 168200318.

It is an arithmetic number, because the mean of its divisors is an integer number (5003365964142).

Almost surely, 2^{20013127515443} is an apocalyptic number.

20013127515443 is a deficient number, since it is larger than the sum of its proper divisors (336341125).

20013127515443 is an equidigital number, since it uses as much as digits as its factorization.

20013127515443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336341124.

The product of its (nonzero) digits is 100800, while the sum is 38.

Adding to 20013127515443 its reverse (34451572131002), we get a palindrome (54464699646445).

The spelling of 20013127515443 in words is "twenty trillion, thirteen billion, one hundred twenty-seven million, five hundred fifteen thousand, four hundred forty-three".