20043178651 has 4 divisors (see below), whose sum is σ = 20064211272. Its totient is φ = 20022146032.

The previous prime is 20043178637. The next prime is 20043178667. The reversal of 20043178651 is 15687134002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15687134002 = 2 ⋅7843567001.

It is a cyclic number.

It is not a de Polignac number, because 20043178651 - 2²⁷ = 19908960923 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 20043178651.

It is not an unprimeable number, because it can be changed into a prime (20043178691) 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, 10514881 + ... + 10516786.

It is an arithmetic number, because the mean of its divisors is an integer number (5016052818).

Almost surely, 2^20043178651 is an apocalyptic number.

20043178651 is a deficient number, since it is larger than the sum of its proper divisors (21032621).

20043178651 is an equidigital number, since it uses as much as digits as its factorization.

20043178651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21032620.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 20043178651 in words is "twenty billion, forty-three million, one hundred seventy-eight thousand, six hundred fifty-one".