19969724 has 12 divisors (see below), whose sum is σ = 35028000. Its totient is φ = 9961728.

The previous prime is 19969723. The next prime is 19969769. The reversal of 19969724 is 42796991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19969723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3764 + ... + 7355.

It is an arithmetic number, because the mean of its divisors is an integer number (2919000).

Almost surely, 2^19969724 is an apocalyptic number.

It is an amenable number.

19969724 is a deficient number, since it is larger than the sum of its proper divisors (15058276).

19969724 is a wasteful number, since it uses less digits than its factorization.

19969724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11572 (or 11570 counting only the distinct ones).

The product of its digits is 244944, while the sum is 47.

The square root of 19969724 is about 4468.7497132867. The cubic root of 19969724 is about 271.3047229736.

The spelling of 19969724 in words is "nineteen million, nine hundred sixty-nine thousand, seven hundred twenty-four".