20884985 has 8 divisors (see below), whose sum is σ = 27340416. Its totient is φ = 15189040.

The previous prime is 20884951. The next prime is 20885003. The reversal of 20884985 is 58948802.

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

It is not a de Polignac number, because 20884985 - 2⁶ = 20884921 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189809 + ... + 189918.

It is an arithmetic number, because the mean of its divisors is an integer number (3417552).

Almost surely, 2^20884985 is an apocalyptic number.

It is an amenable number.

20884985 is a deficient number, since it is larger than the sum of its proper divisors (6455431).

20884985 is a wasteful number, since it uses less digits than its factorization.

20884985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379743.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 20884985 is about 4570.0092997717. The cubic root of 20884985 is about 275.3878164643.

The spelling of 20884985 in words is "twenty million, eight hundred eighty-four thousand, nine hundred eighty-five".