20066985 has 24 divisors (see below), whose sum is σ = 35984520. Its totient is φ = 10332672.

The previous prime is 20066947. The next prime is 20066989. The reversal of 20066985 is 58966002.

It can be written as a sum of positive squares in 4 ways, for example, as 8696601 + 11370384 = 2949^2 + 3372^2 .

It is not a de Polignac number, because 20066985 - 2⁷ = 20066857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20066989) 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 23 ways as a sum of consecutive naturals, for example, 6384 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (1499355).

Almost surely, 2^20066985 is an apocalyptic number.

It is an amenable number.

20066985 is a deficient number, since it is larger than the sum of its proper divisors (15917535).

20066985 is a wasteful number, since it uses less digits than its factorization.

20066985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15417 (or 15414 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 20066985 is about 4479.6188453930. The cubic root of 20066985 is about 271.7444660731.

The spelling of 20066985 in words is "twenty million, sixty-six thousand, nine hundred eighty-five".