20487984 has 40 divisors (see below), whose sum is σ = 57740352. Its totient is φ = 6208320.

The previous prime is 20487977. The next prime is 20487989. The reversal of 20487984 is 48978402.

It is not an unprimeable number, because it can be changed into a prime (20487989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18874 + ... + 19929.

Almost surely, 2^20487984 is an apocalyptic number.

20487984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20487984 is an abundant number, since it is smaller than the sum of its proper divisors (37252368).

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

20487984 is a wasteful number, since it uses less digits than its factorization.

20487984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38825 (or 38819 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 20487984 is about 4526.3654293484. The cubic root of 20487984 is about 273.6317000991.

It can be divided in two parts, 204 and 87984, that added together give a palindrome (88188).

The spelling of 20487984 in words is "twenty million, four hundred eighty-seven thousand, nine hundred eighty-four".