20305984 has 28 divisors (see below), whose sum is σ = 42418000. Its totient is φ = 9618048.

The previous prime is 20305981. The next prime is 20306017. The reversal of 20305984 is 48950302.

It is not an unprimeable number, because it can be changed into a prime (20305981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7134 + ... + 9565.

Almost surely, 2^20305984 is an apocalyptic number.

It is an amenable number.

20305984 is an abundant number, since it is smaller than the sum of its proper divisors (22112016).

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

20305984 is a wasteful number, since it uses less digits than its factorization.

20305984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16730 (or 16720 counting only the distinct ones).

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

The square root of 20305984 is about 4506.2161510518. The cubic root of 20305984 is about 272.8190421946.

The spelling of 20305984 in words is "twenty million, three hundred five thousand, nine hundred eighty-four".