20985167 has 8 divisors (see below), whose sum is σ = 24026112. Its totient is φ = 17955000.

The previous prime is 20985143. The next prime is 20985169. The reversal of 20985167 is 76158902.

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

It is not a de Polignac number, because 20985167 - 2¹⁶ = 20919631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20985167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985169) 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 7 ways as a sum of consecutive naturals, for example, 2042 + ... + 6792.

It is an arithmetic number, because the mean of its divisors is an integer number (3003264).

Almost surely, 2^20985167 is an apocalyptic number.

20985167 is a deficient number, since it is larger than the sum of its proper divisors (3040945).

20985167 is an equidigital number, since it uses as much as digits as its factorization.

20985167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5389.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 20985167 is about 4580.9569960872. The cubic root of 20985167 is about 275.8274450013.

The spelling of 20985167 in words is "twenty million, nine hundred eighty-five thousand, one hundred sixty-seven".