20478372773 has 4 divisors (see below), whose sum is σ = 20914082880. Its totient is φ = 20042662668.

The previous prime is 20478372749. The next prime is 20478372779. The reversal of 20478372773 is 37727387402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37727387402 = 2 ⋅18863693701.

It is a cyclic number.

It is not a de Polignac number, because 20478372773 - 2²⁶ = 20411263909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20478372779) 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, 217854983 + ... + 217855076.

It is an arithmetic number, because the mean of its divisors is an integer number (5228520720).

Almost surely, 2^20478372773 is an apocalyptic number.

It is an amenable number.

20478372773 is a deficient number, since it is larger than the sum of its proper divisors (435710107).

20478372773 is an equidigital number, since it uses as much as digits as its factorization.

20478372773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435710106.

The product of its (nonzero) digits is 2765952, while the sum is 50.

The spelling of 20478372773 in words is "twenty billion, four hundred seventy-eight million, three hundred seventy-two thousand, seven hundred seventy-three".