16720543 has 4 divisors (see below), whose sum is σ = 19109200. Its totient is φ = 14331888.

The previous prime is 16720511. The next prime is 16720547. The reversal of 16720543 is 34502761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16720543 - 2⁵ = 16720511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720547) 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, 1194318 + ... + 1194331.

It is an arithmetic number, because the mean of its divisors is an integer number (4777300).

Almost surely, 2^16720543 is an apocalyptic number.

16720543 is a deficient number, since it is larger than the sum of its proper divisors (2388657).

16720543 is an equidigital number, since it uses as much as digits as its factorization.

16720543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388656.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 16720543 is about 4089.0760570085. The cubic root of 16720543 is about 255.7114210341.

The spelling of 16720543 in words is "sixteen million, seven hundred twenty thousand, five hundred forty-three".