20809847346 has 16 divisors (see below), whose sum is σ = 42189828384. Its totient is φ = 6841593504.

The previous prime is 20809847329. The next prime is 20809847351. The reversal of 20809847346 is 64374890802.

It is a super-3 number, since 3×20809847346³ (a number of 32 digits) contains 333 as substring.

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, 23755096 + ... + 23755971.

It is an arithmetic number, because the mean of its divisors is an integer number (2636864274).

Almost surely, 2^20809847346 is an apocalyptic number.

20809847346 is an abundant number, since it is smaller than the sum of its proper divisors (21379981038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20809847346 is a wasteful number, since it uses less digits than its factorization.

20809847346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47511145.

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 20809847346 in words is "twenty billion, eight hundred nine million, eight hundred forty-seven thousand, three hundred forty-six".