19681332 has 24 divisors (see below), whose sum is σ = 50098272. Its totient is φ = 5964000.

The previous prime is 19681331. The next prime is 19681339. The reversal of 19681332 is 23318691.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 19681293 and 19681302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19681331) 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, 74419 + ... + 74682.

It is an arithmetic number, because the mean of its divisors is an integer number (2087428).

Almost surely, 2^19681332 is an apocalyptic number.

19681332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19681332 is an abundant number, since it is smaller than the sum of its proper divisors (30416940).

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

19681332 is a wasteful number, since it uses less digits than its factorization.

19681332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149119 (or 149117 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 19681332 is about 4436.3647280177. The cubic root of 19681332 is about 269.9923728984.

The spelling of 19681332 in words is "nineteen million, six hundred eighty-one thousand, three hundred thirty-two".