20809474336 has 24 divisors (see below), whose sum is σ = 46821317760. Its totient is φ = 8918346048.

The previous prime is 20809474327. The next prime is 20809474337. The reversal of 20809474336 is 63347490802.

It is not an unprimeable number, because it can be changed into a prime (20809474337) 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, 46449496 + ... + 46449943.

It is an arithmetic number, because the mean of its divisors is an integer number (1950888240).

Almost surely, 2^20809474336 is an apocalyptic number.

It is an amenable number.

20809474336 is an abundant number, since it is smaller than the sum of its proper divisors (26011843424).

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

20809474336 is an equidigital number, since it uses as much as digits as its factorization.

20809474336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92899456 (or 92899448 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 20809474336 in words is "twenty billion, eight hundred nine million, four hundred seventy-four thousand, three hundred thirty-six".