16820525 has 12 divisors (see below), whose sum is σ = 21343872. Its totient is φ = 13142640.

The previous prime is 16820513. The next prime is 16820527. The reversal of 16820525 is 52502861.

It is not a de Polignac number, because 16820525 - 2¹⁰ = 16819501 is a prime.

It is a super-2 number, since 2×16820525² = 565860122551250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16820527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6749 + ... + 8898.

It is an arithmetic number, because the mean of its divisors is an integer number (1778656).

Almost surely, 2^16820525 is an apocalyptic number.

It is an amenable number.

16820525 is a deficient number, since it is larger than the sum of its proper divisors (4523347).

16820525 is a wasteful number, since it uses less digits than its factorization.

16820525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15700 (or 15695 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 16820525 is about 4101.2833357377. The cubic root of 16820525 is about 256.2200916908.

The spelling of 16820525 in words is "sixteen million, eight hundred twenty thousand, five hundred twenty-five".