20984055 has 16 divisors (see below), whose sum is σ = 34658304. Its totient is φ = 10830240.

The previous prime is 20984039. The next prime is 20984071. The reversal of 20984055 is 55048902.

It is an interprime number because it is at equal distance from previous prime (20984039) and next prime (20984071).

It is not a de Polignac number, because 20984055 - 2⁴ = 20984039 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 22099 + ... + 23028.

It is an arithmetic number, because the mean of its divisors is an integer number (2166144).

Almost surely, 2^20984055 is an apocalyptic number.

20984055 is a deficient number, since it is larger than the sum of its proper divisors (13674249).

20984055 is a wasteful number, since it uses less digits than its factorization.

20984055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45166.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 20984055 is about 4580.8356224602. The cubic root of 20984055 is about 275.8225729006.

The spelling of 20984055 in words is "twenty million, nine hundred eighty-four thousand, fifty-five".