16720047 has 8 divisors (see below), whose sum is σ = 24770480. Its totient is φ = 11146680.

The previous prime is 16720043. The next prime is 16720049. The reversal of 16720047 is 74002761.

It is not a de Polignac number, because 16720047 - 2² = 16720043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 619261 = 16720047 / (1 + 6 + 7 + 2 + 0 + 0 + 4 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16720047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720043) 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, 309604 + ... + 309657.

It is an arithmetic number, because the mean of its divisors is an integer number (3096310).

Almost surely, 2^16720047 is an apocalyptic number.

16720047 is a deficient number, since it is larger than the sum of its proper divisors (8050433).

16720047 is an equidigital number, since it uses as much as digits as its factorization.

16720047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619270 (or 619264 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 16720047 is about 4089.0154071610. The cubic root of 16720047 is about 255.7088925253.

The spelling of 16720047 in words is "sixteen million, seven hundred twenty thousand, forty-seven".