19720432 has 10 divisors (see below), whose sum is σ = 38208368. Its totient is φ = 9860208.

The previous prime is 19720403. The next prime is 19720447. The reversal of 19720432 is 23402791.

It is a self number, because there is not a number n which added to its sum of digits gives 19720432.

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, 616248 + ... + 616279.

Almost surely, 2^19720432 is an apocalyptic number.

It is an amenable number.

19720432 is a deficient number, since it is larger than the sum of its proper divisors (18487936).

19720432 is a wasteful number, since it uses less digits than its factorization.

19720432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232535 (or 1232529 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 19720432 is about 4440.7693027222. The cubic root of 19720432 is about 270.1710484516.

The spelling of 19720432 in words is "nineteen million, seven hundred twenty thousand, four hundred thirty-two".