16720906 has 8 divisors (see below), whose sum is σ = 25200864. Its totient is φ = 8320620.

The previous prime is 16720901. The next prime is 16720909. The reversal of 16720906 is 60902761.

16720906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (16720901) 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, 19390 + ... + 20233.

It is an arithmetic number, because the mean of its divisors is an integer number (3150108).

Almost surely, 2^16720906 is an apocalyptic number.

16720906 is a deficient number, since it is larger than the sum of its proper divisors (8479958).

16720906 is a wasteful number, since it uses less digits than its factorization.

16720906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39836.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 16720906 is about 4089.1204433227. The cubic root of 16720906 is about 255.7132715038.

The spelling of 16720906 in words is "sixteen million, seven hundred twenty thousand, nine hundred six".