20522785 has 16 divisors (see below), whose sum is σ = 26251776. Its totient is φ = 15366208.

The previous prime is 20522783. The next prime is 20522849. The reversal of 20522785 is 58722502.

It is not a de Polignac number, because 20522785 - 2¹ = 20522783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20522783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3507 + ... + 7303.

It is an arithmetic number, because the mean of its divisors is an integer number (1640736).

Almost surely, 2^20522785 is an apocalyptic number.

It is an amenable number.

20522785 is a deficient number, since it is larger than the sum of its proper divisors (5728991).

20522785 is a wasteful number, since it uses less digits than its factorization.

20522785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3872.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20522785 is about 4530.2080526175. The cubic root of 20522785 is about 273.7865432197.

The spelling of 20522785 in words is "twenty million, five hundred twenty-two thousand, seven hundred eighty-five".