20783984 has 20 divisors (see below), whose sum is σ = 43367016. Its totient is φ = 9592512.

The previous prime is 20783969. The next prime is 20783993. The reversal of 20783984 is 48938702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49754 + ... + 50169.

Almost surely, 2^20783984 is an apocalyptic number.

It is an amenable number.

20783984 is an abundant number, since it is smaller than the sum of its proper divisors (22583032).

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

20783984 is a wasteful number, since it uses less digits than its factorization.

20783984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99944 (or 99938 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20783984 is about 4558.9454921067. The cubic root of 20783984 is about 274.9431684213.

The spelling of 20783984 in words is "twenty million, seven hundred eighty-three thousand, nine hundred eighty-four".