20378766878787 has 8 divisors (see below), whose sum is σ = 27171722733904. Its totient is φ = 13585827804768.

The previous prime is 20378766878777. The next prime is 20378766878809. The reversal of 20378766878787 is 78787866787302.

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

It is not a de Polignac number, because 20378766878787 - 2⁸ = 20378766878531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20378766878707) 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 7 ways as a sum of consecutive naturals, for example, 1017928 + ... + 6464805.

It is an arithmetic number, because the mean of its divisors is an integer number (3396465341738).

Almost surely, 2^{20378766878787} is an apocalyptic number.

20378766878787 is a deficient number, since it is larger than the sum of its proper divisors (6792955855117).

20378766878787 is an equidigital number, since it uses as much as digits as its factorization.

20378766878787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8390549.

The product of its (nonzero) digits is 14869757952, while the sum is 84.

The spelling of 20378766878787 in words is "twenty trillion, three hundred seventy-eight billion, seven hundred sixty-six million, eight hundred seventy-eight thousand, seven hundred eighty-seven".