19720966 has 8 divisors (see below), whose sum is σ = 29938104. Its totient is φ = 9741600.

The previous prime is 19720949. The next prime is 19720997. The reversal of 19720966 is 66902791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59235 + ... + 59566.

It is an arithmetic number, because the mean of its divisors is an integer number (3742263).

Almost surely, 2^19720966 is an apocalyptic number.

19720966 is a deficient number, since it is larger than the sum of its proper divisors (10217138).

19720966 is a wasteful number, since it uses less digits than its factorization.

19720966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118886.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 19720966 is about 4440.8294270327. The cubic root of 19720966 is about 270.1734870398.

The spelling of 19720966 in words is "nineteen million, seven hundred twenty thousand, nine hundred sixty-six".