20984535 has 64 divisors (see below), whose sum is σ = 43868160. Its totient is φ = 9383040.

The previous prime is 20984503. The next prime is 20984581. The reversal of 20984535 is 53548902.

It is not a de Polignac number, because 20984535 - 2⁵ = 20984503 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20984535.

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 63 ways as a sum of consecutive naturals, for example, 18762 + ... + 19848.

It is an arithmetic number, because the mean of its divisors is an integer number (685440).

Almost surely, 2^20984535 is an apocalyptic number.

20984535 is an abundant number, since it is smaller than the sum of its proper divisors (22883625).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20984535 is a wasteful number, since it uses less digits than its factorization.

20984535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 20984535 is about 4580.8880143483. Note that the first 3 decimals coincide. The cubic root of 20984535 is about 275.8246759868.

The spelling of 20984535 in words is "twenty million, nine hundred eighty-four thousand, five hundred thirty-five".