20855439594 has 48 divisors (see below), whose sum is σ = 49621201344.
Its totient is φ = 6277968000.
The previous prime is 20855439587. The next prime is 20855439607. The reversal of 20855439594 is 49593455802.
20855439594 is a `hidden beast` number, since 2 + 0 + 8 + 5 + 5 + 43 + 9 + 594 = 666.
It is a self number, because there is not a number n which added to its sum of digits gives 20855439594.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 318879 + ... + 378674.
It is an arithmetic number, because the mean of its divisors is an integer number (1033775028).
Almost surely, 220855439594 is an apocalyptic number.
20855439594 is an abundant number, since it is smaller than the sum of its proper divisors (28765761750).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20855439594 is a wasteful number, since it uses less digits than its factorization.
20855439594 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 697723 (or 697720 counting only the distinct ones).
The product of its (nonzero) digits is 7776000, while the sum is 54.
The spelling of 20855439594 in words is "twenty billion, eight hundred fifty-five million, four hundred thirty-nine thousand, five hundred ninety-four".