20778375526845 has 8 divisors (see below), whose sum is σ = 33245400842976. Its totient is φ = 11081800280976.

The previous prime is 20778375526837. The next prime is 20778375526847. The reversal of 20778375526845 is 54862557387702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20778375526845 - 2³ = 20778375526837 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20778375526845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778375526847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 692612517547 + ... + 692612517576.

It is an arithmetic number, because the mean of its divisors is an integer number (4155675105372).

Almost surely, 2^{20778375526845} is an apocalyptic number.

It is an amenable number.

20778375526845 is a deficient number, since it is larger than the sum of its proper divisors (12467025316131).

20778375526845 is a wasteful number, since it uses less digits than its factorization.

20778375526845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385225035131.

The product of its (nonzero) digits is 790272000, while the sum is 69.

The spelling of 20778375526845 in words is "twenty trillion, seven hundred seventy-eight billion, three hundred seventy-five million, five hundred twenty-six thousand, eight hundred forty-five".