16920194 has 4 divisors (see below), whose sum is σ = 25380294. Its totient is φ = 8460096.

The previous prime is 16920191. The next prime is 16920217. The reversal of 16920194 is 49102961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49102961 = 71 ⋅691591.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 69169 = 4105^2 + 263^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16920194.

It is not an unprimeable number, because it can be changed into a prime (16920191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4230047 + ... + 4230050.

Almost surely, 2^16920194 is an apocalyptic number.

16920194 is a deficient number, since it is larger than the sum of its proper divisors (8460100).

16920194 is an equidigital number, since it uses as much as digits as its factorization.

16920194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8460099.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 16920194 is about 4113.4163416800. The cubic root of 16920194 is about 256.7251676025.

The spelling of 16920194 in words is "sixteen million, nine hundred twenty thousand, one hundred ninety-four".