16820516 has 6 divisors (see below), whose sum is σ = 29435910. Its totient is φ = 8410256.

The previous prime is 16820513. The next prime is 16820527. The reversal of 16820516 is 61502861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16728100 + 92416 = 4090^2 + 304^2 .

It is not an unprimeable number, because it can be changed into a prime (16820513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2102561 + ... + 2102568.

It is an arithmetic number, because the mean of its divisors is an integer number (4905985).

Almost surely, 2^16820516 is an apocalyptic number.

It is an amenable number.

16820516 is a deficient number, since it is larger than the sum of its proper divisors (12615394).

16820516 is a wasteful number, since it uses less digits than its factorization.

16820516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205133 (or 4205131 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 16820516 is about 4101.2822385200. The cubic root of 16820516 is about 256.2200459931.

The spelling of 16820516 in words is "sixteen million, eight hundred twenty thousand, five hundred sixteen".