20854189784 has 32 divisors (see below), whose sum is σ = 41257944000. Its totient is φ = 9854694432.

The previous prime is 20854189777. The next prime is 20854189801. The reversal of 20854189784 is 48798145802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100034 + ... + 227409.

It is an arithmetic number, because the mean of its divisors is an integer number (1289310750).

Almost surely, 2^20854189784 is an apocalyptic number.

It is an amenable number.

20854189784 is a deficient number, since it is larger than the sum of its proper divisors (20403754216).

20854189784 is a wasteful number, since it uses less digits than its factorization.

20854189784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327887 (or 327883 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 56.

The spelling of 20854189784 in words is "twenty billion, eight hundred fifty-four million, one hundred eighty-nine thousand, seven hundred eighty-four".