20786785 has 8 divisors (see below), whose sum is σ = 25618536. Its totient is φ = 16179840.

The previous prime is 20786761. The next prime is 20786797. The reversal of 20786785 is 58768702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1846881 + 18939904 = 1359^2 + 4352^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20786785 - 2¹⁹ = 20262497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55996 + ... + 56365.

It is an arithmetic number, because the mean of its divisors is an integer number (3202317).

Almost surely, 2^20786785 is an apocalyptic number.

It is an amenable number.

20786785 is a deficient number, since it is larger than the sum of its proper divisors (4831751).

20786785 is a wasteful number, since it uses less digits than its factorization.

20786785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112403.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 20786785 is about 4559.2526799904. The cubic root of 20786785 is about 274.9555189764.

The spelling of 20786785 in words is "twenty million, seven hundred eighty-six thousand, seven hundred eighty-five".