16720546 has 16 divisors (see below), whose sum is σ = 25701624. Its totient is φ = 8155264.

The previous prime is 16720511. The next prime is 16720547. The reversal of 16720546 is 64502761.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16605625 + 114921 = 4075^2 + 339^2 .

It is not an unprimeable number, because it can be changed into a prime (16720547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24360 + ... + 25036.

Almost surely, 2^16720546 is an apocalyptic number.

16720546 is a deficient number, since it is larger than the sum of its proper divisors (8981078).

16720546 is a wasteful number, since it uses less digits than its factorization.

16720546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 16720546 is about 4089.0764238395. The cubic root of 16720546 is about 255.7114363273.

The spelling of 16720546 in words is "sixteen million, seven hundred twenty thousand, five hundred forty-six".