20819479805 has 8 divisors (see below), whose sum is σ = 26298290400. Its totient is φ = 15778974096.

The previous prime is 20819479783. The next prime is 20819479819. The reversal of 20819479805 is 50897491802.

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 20819479805 - 2²⁰ = 20818431229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109576115 + ... + 109576304.

It is an arithmetic number, because the mean of its divisors is an integer number (3287286300).

Almost surely, 2^20819479805 is an apocalyptic number.

It is an amenable number.

20819479805 is a deficient number, since it is larger than the sum of its proper divisors (5478810595).

20819479805 is a wasteful number, since it uses less digits than its factorization.

20819479805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219152443.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 20819479805 in words is "twenty billion, eight hundred nineteen million, four hundred seventy-nine thousand, eight hundred five".