20780712055 has 4 divisors (see below), whose sum is σ = 24936854472. Its totient is φ = 16624569640.

The previous prime is 20780712031. The next prime is 20780712077. The reversal of 20780712055 is 55021708702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55021708702 = 2 ⋅27510854351.

It is not a de Polignac number, because 20780712055 - 2¹³ = 20780703863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2078071201 + ... + 2078071210.

It is an arithmetic number, because the mean of its divisors is an integer number (6234213618).

Almost surely, 2^20780712055 is an apocalyptic number.

20780712055 is a deficient number, since it is larger than the sum of its proper divisors (4156142417).

20780712055 is an equidigital number, since it uses as much as digits as its factorization.

20780712055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156142416.

The product of its (nonzero) digits is 39200, while the sum is 37.

The spelling of 20780712055 in words is "twenty billion, seven hundred eighty million, seven hundred twelve thousand, fifty-five".