16820773 has 4 divisors (see below), whose sum is σ = 16829100. Its totient is φ = 16812448.

The previous prime is 16820761. The next prime is 16820789. The reversal of 16820773 is 37702861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 37702861 = 7 ⋅5386123.

It can be written as a sum of positive squares in 2 ways, for example, as 1595169 + 15225604 = 1263^2 + 3902^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16820773 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 (16820743) 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, 1011 + ... + 5887.

It is an arithmetic number, because the mean of its divisors is an integer number (4207275).

Almost surely, 2^16820773 is an apocalyptic number.

It is an amenable number.

16820773 is a deficient number, since it is larger than the sum of its proper divisors (8327).

16820773 is an equidigital number, since it uses as much as digits as its factorization.

16820773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8326.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 16820773 is about 4101.3135700651. The cubic root of 16820773 is about 256.2213509117.

The spelling of 16820773 in words is "sixteen million, eight hundred twenty thousand, seven hundred seventy-three".