20780762530778 has 4 divisors (see below), whose sum is σ = 31171143796170. Its totient is φ = 10390381265388.

The previous prime is 20780762530769. The next prime is 20780762530799. The reversal of 20780762530778 is 87703526708702.

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

It can be written as a sum of positive squares in only one way, i.e., 19315348175929 + 1465414354849 = 4394923^2 + 1210543^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20780762530778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5195190632693 + ... + 5195190632696.

Almost surely, 2^{20780762530778} is an apocalyptic number.

20780762530778 is a deficient number, since it is larger than the sum of its proper divisors (10390381265392).

20780762530778 is a wasteful number, since it uses less digits than its factorization.

20780762530778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10390381265391.

The product of its (nonzero) digits is 55319040, while the sum is 62.

The spelling of 20780762530778 in words is "twenty trillion, seven hundred eighty billion, seven hundred sixty-two million, five hundred thirty thousand, seven hundred seventy-eight".