16820723 has 8 divisors (see below), whose sum is σ = 17238960. Its totient is φ = 16407040.

The previous prime is 16820717. The next prime is 16820729. The reversal of 16820723 is 32702861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16820717) and next prime (16820729).

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

It is a cyclic number.

It is not a de Polignac number, because 16820723 - 2⁴ = 16820707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16820729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7043 + ... + 9123.

It is an arithmetic number, because the mean of its divisors is an integer number (2154870).

Almost surely, 2^16820723 is an apocalyptic number.

16820723 is a deficient number, since it is larger than the sum of its proper divisors (418237).

16820723 is a wasteful number, since it uses less digits than its factorization.

16820723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 16820723 is about 4101.3074744525. The cubic root of 16820723 is about 256.2210970375.

The spelling of 16820723 in words is "sixteen million, eight hundred twenty thousand, seven hundred twenty-three".