20914985 has 32 divisors (see below), whose sum is σ = 31637760. Its totient is φ = 12918528.

The previous prime is 20914951. The next prime is 20914997. The reversal of 20914985 is 58941902.

It is not a de Polignac number, because 20914985 - 2²⁰ = 19866409 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 19031 + ... + 20099.

It is an arithmetic number, because the mean of its divisors is an integer number (988680).

Almost surely, 2^20914985 is an apocalyptic number.

It is an amenable number.

20914985 is a deficient number, since it is larger than the sum of its proper divisors (10722775).

20914985 is a wasteful number, since it uses less digits than its factorization.

20914985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 20914985 is about 4573.2903909549. The cubic root of 20914985 is about 275.5196126147.

The spelling of 20914985 in words is "twenty million, nine hundred fourteen thousand, nine hundred eighty-five".