20485185356 has 12 divisors (see below), whose sum is σ = 35877112320. Its totient is φ = 10234581840.

The previous prime is 20485185353. The next prime is 20485185421. The reversal of 20485185356 is 65358158402.

It is a self number, because there is not a number n which added to its sum of digits gives 20485185356.

It is not an unprimeable number, because it can be changed into a prime (20485185353) 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, 1996955 + ... + 2007186.

It is an arithmetic number, because the mean of its divisors is an integer number (2989759360).

Almost surely, 2^20485185356 is an apocalyptic number.

It is an amenable number.

20485185356 is a deficient number, since it is larger than the sum of its proper divisors (15391926964).

20485185356 is a wasteful number, since it uses less digits than its factorization.

20485185356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005424 (or 4005422 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 47.

The spelling of 20485185356 in words is "twenty billion, four hundred eighty-five million, one hundred eighty-five thousand, three hundred fifty-six".