20189984 has 24 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 10052416.

The previous prime is 20189971. The next prime is 20190013. The reversal of 20189984 is 48998102.

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, 7217 + ... + 9615.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^20189984 is an apocalyptic number.

It is an amenable number.

20189984 is a deficient number, since it is larger than the sum of its proper divisors (19726816).

20189984 is a wasteful number, since it uses less digits than its factorization.

20189984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672 (or 2664 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 20189984 is about 4493.3266073145. The cubic root of 20189984 is about 272.2985476263.

The spelling of 20189984 in words is "twenty million, one hundred eighty-nine thousand, nine hundred eighty-four".