20127023643 has 4 divisors (see below), whose sum is σ = 26836031528. Its totient is φ = 13418015760.

The previous prime is 20127023573. The next prime is 20127023647. The reversal of 20127023643 is 34632072102.

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

It is a de Polignac number, because none of the positive numbers 2^k-20127023643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20127023643.

It is not an unprimeable number, because it can be changed into a prime (20127023647) 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, 3354503938 + ... + 3354503943.

It is an arithmetic number, because the mean of its divisors is an integer number (6709007882).

Almost surely, 2^20127023643 is an apocalyptic number.

20127023643 is a deficient number, since it is larger than the sum of its proper divisors (6709007885).

20127023643 is an equidigital number, since it uses as much as digits as its factorization.

20127023643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6709007884.

The product of its (nonzero) digits is 12096, while the sum is 30.

Adding to 20127023643 its reverse (34632072102), we get a palindrome (54759095745).

The spelling of 20127023643 in words is "twenty billion, one hundred twenty-seven million, twenty-three thousand, six hundred forty-three".