20809847347 has 8 divisors (see below), whose sum is σ = 21574548000. Its totient is φ = 20048288064.

The previous prime is 20809847329. The next prime is 20809847351. The reversal of 20809847347 is 74374890802.

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 20809847347 - 2¹⁵ = 20809814579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20809847294 and 20809847303.

It is not an unprimeable number, because it can be changed into a prime (20809847447) 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, 771847 + ... + 798352.

It is an arithmetic number, because the mean of its divisors is an integer number (2696818500).

Almost surely, 2^20809847347 is an apocalyptic number.

20809847347 is a deficient number, since it is larger than the sum of its proper divisors (764700653).

20809847347 is a wasteful number, since it uses less digits than its factorization.

20809847347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570685.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 20809847347 in words is "twenty billion, eight hundred nine million, eight hundred forty-seven thousand, three hundred forty-seven".