19666372 has 36 divisors (see below), whose sum is σ = 38208240. Its totient is φ = 8850160.

The previous prime is 19666337. The next prime is 19666373. The reversal of 19666372 is 27366691.

Its product of digits (81648) is a multiple of the sum of its prime factors (432).

It is not an unprimeable number, because it can be changed into a prime (19666373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86523 + ... + 86749.

It is an arithmetic number, because the mean of its divisors is an integer number (1061340).

Almost surely, 2^19666372 is an apocalyptic number.

It is an amenable number.

19666372 is a deficient number, since it is larger than the sum of its proper divisors (18541868).

19666372 is a wasteful number, since it uses less digits than its factorization.

19666372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 419 counting only the distinct ones).

The product of its digits is 81648, while the sum is 40.

The square root of 19666372 is about 4434.6783423378. The cubic root of 19666372 is about 269.9239474870.

It can be divided in two parts, 1966 and 6372, that added together give a palindrome (8338).

The spelling of 19666372 in words is "nineteen million, six hundred sixty-six thousand, three hundred seventy-two".