16820745 has 8 divisors (see below), whose sum is σ = 26913216. Its totient is φ = 8971056.

The previous prime is 16820743. The next prime is 16820761. The reversal of 16820745 is 54702861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16820745 - 2¹ = 16820743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16820743) 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 in 7 ways as a sum of consecutive naturals, for example, 560677 + ... + 560706.

It is an arithmetic number, because the mean of its divisors is an integer number (3364152).

Almost surely, 2^16820745 is an apocalyptic number.

16820745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16820745 is a deficient number, since it is larger than the sum of its proper divisors (10092471).

16820745 is a wasteful number, since it uses less digits than its factorization.

16820745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121391.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 16820745 is about 4101.3101565232. The cubic root of 16820745 is about 256.2212087422.

The spelling of 16820745 in words is "sixteen million, eight hundred twenty thousand, seven hundred forty-five".