20878716887 has 12 divisors (see below), whose sum is σ = 24421682376. Its totient is φ = 17797162320.

The previous prime is 20878716883. The next prime is 20878716899. The reversal of 20878716887 is 78861787802.

It is not a de Polignac number, because 20878716887 - 2² = 20878716883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20878716883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1168193 + ... + 1185930.

It is an arithmetic number, because the mean of its divisors is an integer number (2035140198).

Almost surely, 2^20878716887 is an apocalyptic number.

20878716887 is a deficient number, since it is larger than the sum of its proper divisors (3542965489).

20878716887 is a wasteful number, since it uses less digits than its factorization.

20878716887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354318 (or 2354311 counting only the distinct ones).

The product of its (nonzero) digits is 16859136, while the sum is 62.

The spelling of 20878716887 in words is "twenty billion, eight hundred seventy-eight million, seven hundred sixteen thousand, eight hundred eighty-seven".