19987072 has 32 divisors (see below), whose sum is σ = 45508320. Its totient is φ = 8565504.

The previous prime is 19987057. The next prime is 19987073. The reversal of 19987072 is 27078991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (19987073) 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, 10258 + ... + 12049.

It is an arithmetic number, because the mean of its divisors is an integer number (1422135).

Almost surely, 2^19987072 is an apocalyptic number.

It is an amenable number.

19987072 is an abundant number, since it is smaller than the sum of its proper divisors (25521248).

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

19987072 is an equidigital number, since it uses as much as digits as its factorization.

19987072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22328 (or 22316 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 19987072 is about 4470.6903270077. The cubic root of 19987072 is about 271.3832624015.

The spelling of 19987072 in words is "nineteen million, nine hundred eighty-seven thousand, seventy-two".