16820573 has 18 divisors (see below), whose sum is σ = 21514878. Its totient is φ = 13102320.

The previous prime is 16820563. The next prime is 16820579. The reversal of 16820573 is 37502861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9966649 + 6853924 = 3157^2 + 2618^2 .

It is not a de Polignac number, because 16820573 - 2⁸ = 16820317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16820579) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4511 + ... + 7347.

It is an arithmetic number, because the mean of its divisors is an integer number (1195271).

Almost surely, 2^16820573 is an apocalyptic number.

It is an amenable number.

16820573 is a deficient number, since it is larger than the sum of its proper divisors (4694305).

16820573 is a wasteful number, since it uses less digits than its factorization.

16820573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873 (or 2855 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 16820573 is about 4101.2891875604. The cubic root of 16820573 is about 256.2203354120.

The spelling of 16820573 in words is "sixteen million, eight hundred twenty thousand, five hundred seventy-three".