20854785 has 64 divisors (see below), whose sum is σ = 40550400. Its totient is φ = 8951040.

The previous prime is 20854739. The next prime is 20854843. The reversal of 20854785 is 58745802.

It is not a de Polignac number, because 20854785 - 2¹⁰ = 20853761 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 139891 + ... + 140039.

It is an arithmetic number, because the mean of its divisors is an integer number (633600).

Almost surely, 2^20854785 is an apocalyptic number.

It is an amenable number.

20854785 is a deficient number, since it is larger than the sum of its proper divisors (19695615).

20854785 is a wasteful number, since it uses less digits than its factorization.

20854785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238.

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 20854785 is about 4566.7039536191. The cubic root of 20854785 is about 275.2550141348.

The spelling of 20854785 in words is "twenty million, eight hundred fifty-four thousand, seven hundred eighty-five".