16720329 has 8 divisors (see below), whose sum is σ = 22349920. Its totient is φ = 11118816.

The previous prime is 16720321. The next prime is 16720349. The reversal of 16720329 is 92302761.

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

It is not a de Polignac number, because 16720329 - 2³ = 16720321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16720296 and 16720305.

It is not an unprimeable number, because it can be changed into a prime (16720321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5587 + ... + 8040.

It is an arithmetic number, because the mean of its divisors is an integer number (2793740).

Almost surely, 2^16720329 is an apocalyptic number.

It is an amenable number.

16720329 is a deficient number, since it is larger than the sum of its proper divisors (5629591).

16720329 is a wasteful number, since it uses less digits than its factorization.

16720329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14039.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 16720329 is about 4089.0498896443. The cubic root of 16720329 is about 255.7103301110.

The spelling of 16720329 in words is "sixteen million, seven hundred twenty thousand, three hundred twenty-nine".