20545623879 has 16 divisors (see below), whose sum is σ = 30036251520. Its totient is φ = 12388681760.

The previous prime is 20545623869. The next prime is 20545623907. The reversal of 20545623879 is 97832654502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20545623879 - 2⁴ = 20545623863 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545623869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1573689 + ... + 1586690.

It is an arithmetic number, because the mean of its divisors is an integer number (1877265720).

Almost surely, 2^20545623879 is an apocalyptic number.

20545623879 is a deficient number, since it is larger than the sum of its proper divisors (9490627641).

20545623879 is a wasteful number, since it uses less digits than its factorization.

20545623879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160590.

The product of its (nonzero) digits is 3628800, while the sum is 51.

The spelling of 20545623879 in words is "twenty billion, five hundred forty-five million, six hundred twenty-three thousand, eight hundred seventy-nine".