16720547 has 2 divisors, whose sum is σ = 16720548. Its totient is φ = 16720546.

The previous prime is 16720511. The next prime is 16720549. The reversal of 16720547 is 74502761.

It is a strong prime.

It is an emirp because it is prime and its reverse (74502761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16720547 - 2¹⁶ = 16655011 is a prime.

Together with 16720549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16720549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360273 + 8360274.

It is an arithmetic number, because the mean of its divisors is an integer number (8360274).

Almost surely, 2^16720547 is an apocalyptic number.

16720547 is a deficient number, since it is larger than the sum of its proper divisors (1).

16720547 is an equidigital number, since it uses as much as digits as its factorization.

16720547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 16720547 is about 4089.0765461165. The cubic root of 16720547 is about 255.7114414251.

The spelling of 16720547 in words is "sixteen million, seven hundred twenty thousand, five hundred forty-seven".