20578878678103 has 4 divisors (see below), whose sum is σ = 21135064588360. Its totient is φ = 20022692767848.

The previous prime is 20578878678097. The next prime is 20578878678167. The reversal of 20578878678103 is 30187687887502.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20578878678103 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 (20578878658103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278092955073 + ... + 278092955146.

It is an arithmetic number, because the mean of its divisors is an integer number (5283766147090).

Almost surely, 2^{20578878678103} is an apocalyptic number.

20578878678103 is a deficient number, since it is larger than the sum of its proper divisors (556185910257).

20578878678103 is an equidigital number, since it uses as much as digits as its factorization.

20578878678103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556185910256.

The product of its (nonzero) digits is 252887040, while the sum is 70.

The spelling of 20578878678103 in words is "twenty trillion, five hundred seventy-eight billion, eight hundred seventy-eight million, six hundred seventy-eight thousand, one hundred three".