19729916 has 6 divisors (see below), whose sum is σ = 34527360. Its totient is φ = 9864956.

The previous prime is 19729909. The next prime is 19729933. The reversal of 19729916 is 61992791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2466236 + ... + 2466243.

It is an arithmetic number, because the mean of its divisors is an integer number (5754560).

Almost surely, 2^19729916 is an apocalyptic number.

It is an amenable number.

19729916 is a deficient number, since it is larger than the sum of its proper divisors (14797444).

19729916 is a wasteful number, since it uses less digits than its factorization.

19729916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932483 (or 4932481 counting only the distinct ones).

The product of its digits is 61236, while the sum is 44.

The square root of 19729916 is about 4441.8370073653. The cubic root of 19729916 is about 270.2143519583.

The spelling of 19729916 in words is "nineteen million, seven hundred twenty-nine thousand, nine hundred sixteen".