20530473779 has 4 divisors (see below), whose sum is σ = 20531836776. Its totient is φ = 20529110784.

The previous prime is 20530473773. The next prime is 20530473811. The reversal of 20530473779 is 97737403502.

It is a happy number.

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 20530473779 - 2²⁸ = 20262038323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20530473773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658649 + ... + 689114.

It is an arithmetic number, because the mean of its divisors is an integer number (5132959194).

Almost surely, 2^20530473779 is an apocalyptic number.

20530473779 is a deficient number, since it is larger than the sum of its proper divisors (1362997).

20530473779 is a wasteful number, since it uses less digits than its factorization.

20530473779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362996.

The product of its (nonzero) digits is 1111320, while the sum is 47.

The spelling of 20530473779 in words is "twenty billion, five hundred thirty million, four hundred seventy-three thousand, seven hundred seventy-nine".