16920217 has 2 divisors, whose sum is σ = 16920218. Its totient is φ = 16920216.

The previous prime is 16920191. The next prime is 16920221. The reversal of 16920217 is 71202961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9865881 + 7054336 = 3141^2 + 2656^2 .

It is a cyclic number.

It is not a de Polignac number, because 16920217 - 2¹¹ = 16918169 is a prime.

It is not a weakly prime, because it can be changed into another prime (16920257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8460108 + 8460109.

It is an arithmetic number, because the mean of its divisors is an integer number (8460109).

Almost surely, 2^16920217 is an apocalyptic number.

It is an amenable number.

16920217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16920217 is an equidigital number, since it uses as much as digits as its factorization.

16920217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 16920217 is about 4113.4191374087. The cubic root of 16920217 is about 256.7252839266.

The spelling of 16920217 in words is "sixteen million, nine hundred twenty thousand, two hundred seventeen".