20878467899 has 4 divisors (see below), whose sum is σ = 20878801320. Its totient is φ = 20878134480.

The previous prime is 20878467871. The next prime is 20878467917. The reversal of 20878467899 is 99876487802.

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

It is a cyclic number.

It is not a de Polignac number, because 20878467899 - 2²⁰ = 20877419323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20878466899) 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, 41369 + ... + 208490.

It is an arithmetic number, because the mean of its divisors is an integer number (5219700330).

Almost surely, 2^20878467899 is an apocalyptic number.

20878467899 is a deficient number, since it is larger than the sum of its proper divisors (333421).

20878467899 is an equidigital number, since it uses as much as digits as its factorization.

20878467899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333420.

The product of its (nonzero) digits is 97542144, while the sum is 68.

The spelling of 20878467899 in words is "twenty billion, eight hundred seventy-eight million, four hundred sixty-seven thousand, eight hundred ninety-nine".