20503984 has 20 divisors (see below), whose sum is σ = 39808216. Its totient is φ = 10230912.

The previous prime is 20503981. The next prime is 20503993. The reversal of 20503984 is 48930502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503981) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9292 + ... + 11284.

Almost surely, 2^20503984 is an apocalyptic number.

It is an amenable number.

20503984 is a deficient number, since it is larger than the sum of its proper divisors (19304232).

20503984 is a wasteful number, since it uses less digits than its factorization.

20503984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644 (or 2638 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20503984 is about 4528.1325068951. The cubic root of 20503984 is about 273.7029120512.

The spelling of 20503984 in words is "twenty million, five hundred three thousand, nine hundred eighty-four".