20871651899 has 8 divisors (see below), whose sum is σ = 23861288928. Its totient is φ = 17884008000.

The previous prime is 20871651877. The next prime is 20871651901. The reversal of 20871651899 is 99815617802.

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

It is a cyclic number.

It is not a de Polignac number, because 20871651899 - 2⁸ = 20871651643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871651809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475772 + ... + 517785.

It is an arithmetic number, because the mean of its divisors is an integer number (2982661116).

Almost surely, 2^20871651899 is an apocalyptic number.

20871651899 is a deficient number, since it is larger than the sum of its proper divisors (2989637029).

20871651899 is an equidigital number, since it uses as much as digits as its factorization.

20871651899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996565.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 20871651899 in words is "twenty billion, eight hundred seventy-one million, six hundred fifty-one thousand, eight hundred ninety-nine".