19713872 has 20 divisors (see below), whose sum is σ = 38435040. Its totient is φ = 9795168.

The previous prime is 19713871. The next prime is 19713877. The reversal of 19713872 is 27831791.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19713871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172 + ... + 6387.

It is an arithmetic number, because the mean of its divisors is an integer number (1921752).

Almost surely, 2^19713872 is an apocalyptic number.

It is an amenable number.

19713872 is a deficient number, since it is larger than the sum of its proper divisors (18721168).

19713872 is a wasteful number, since it uses less digits than its factorization.

19713872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7730 (or 7724 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 19713872 is about 4440.0306305250. The cubic root of 19713872 is about 270.1410876706.

The spelling of 19713872 in words is "nineteen million, seven hundred thirteen thousand, eight hundred seventy-two".