16920517 has 8 divisors (see below), whose sum is σ = 17338752. Its totient is φ = 16504800.

The previous prime is 16920511. The next prime is 16920521. The reversal of 16920517 is 71502961.

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 16920517 - 2¹⁹ = 16396229 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 (16920511) 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, 24142 + ... + 24832.

It is an arithmetic number, because the mean of its divisors is an integer number (2167344).

Almost surely, 2^16920517 is an apocalyptic number.

It is an amenable number.

16920517 is a deficient number, since it is larger than the sum of its proper divisors (418235).

16920517 is an equidigital number, since it uses as much as digits as its factorization.

16920517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 16920517 is about 4113.4556032611. The cubic root of 16920517 is about 256.7268011870.

The spelling of 16920517 in words is "sixteen million, nine hundred twenty thousand, five hundred seventeen".