19981632 has 56 divisors (see below), whose sum is σ = 57680352. Its totient is φ = 6054400.

The previous prime is 19981567. The next prime is 19981649. The reversal of 19981632 is 23618991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2619 + ... + 6842.

Almost surely, 2^19981632 is an apocalyptic number.

19981632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19981632 is an abundant number, since it is smaller than the sum of its proper divisors (37698720).

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

19981632 is a wasteful number, since it uses less digits than its factorization.

19981632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9487 (or 9477 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 19981632 is about 4470.0818784447. The cubic root of 19981632 is about 271.3586388363.

The spelling of 19981632 in words is "nineteen million, nine hundred eighty-one thousand, six hundred thirty-two".