20687878707 has 8 divisors (see below), whose sum is σ = 27702224784. Its totient is φ = 13732725888.

The previous prime is 20687878693. The next prime is 20687878711. The reversal of 20687878707 is 70787878602.

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

It is not a de Polignac number, because 20687878707 - 2²² = 20683684403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20687878007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14797498 + ... + 14798895.

It is an arithmetic number, because the mean of its divisors is an integer number (3462778098).

Almost surely, 2^20687878707 is an apocalyptic number.

20687878707 is a deficient number, since it is larger than the sum of its proper divisors (7014346077).

20687878707 is a wasteful number, since it uses less digits than its factorization.

20687878707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29596629.

The product of its (nonzero) digits is 14751744, while the sum is 60.

The spelling of 20687878707 in words is "twenty billion, six hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred seven".