20854189785 has 32 divisors (see below), whose sum is σ = 39200047488. Its totient is φ = 9333342720.

The previous prime is 20854189777. The next prime is 20854189801. The reversal of 20854189785 is 58798145802.

It is not a de Polignac number, because 20854189785 - 2³ = 20854189777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4858972 + ... + 4863261.

It is an arithmetic number, because the mean of its divisors is an integer number (1225001484).

Almost surely, 2^20854189785 is an apocalyptic number.

It is an amenable number.

20854189785 is a deficient number, since it is larger than the sum of its proper divisors (18345857703).

20854189785 is a wasteful number, since it uses less digits than its factorization.

20854189785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9722265.

The product of its (nonzero) digits is 6451200, while the sum is 57.

The spelling of 20854189785 in words is "twenty billion, eight hundred fifty-four million, one hundred eighty-nine thousand, seven hundred eighty-five".