20748875473 has 4 divisors (see below), whose sum is σ = 20796794788. Its totient is φ = 20700956160.

The previous prime is 20748875467. The next prime is 20748875489. The reversal of 20748875473 is 37457884702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4459969089 + 16288906384 = 66783^2 + 127628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20748875473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748875443) 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, 23959008 + ... + 23959873.

It is an arithmetic number, because the mean of its divisors is an integer number (5199198697).

Almost surely, 2^20748875473 is an apocalyptic number.

It is an amenable number.

20748875473 is a deficient number, since it is larger than the sum of its proper divisors (47919315).

20748875473 is an equidigital number, since it uses as much as digits as its factorization.

20748875473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47919314.

The product of its (nonzero) digits is 10536960, while the sum is 55.

The spelling of 20748875473 in words is "twenty billion, seven hundred forty-eight million, eight hundred seventy-five thousand, four hundred seventy-three".