16820019 has 12 divisors (see below), whose sum is σ = 24405576. Its totient is φ = 11162592.

The previous prime is 16820017. The next prime is 16820039. The reversal of 16820019 is 91002861.

It is not a de Polignac number, because 16820019 - 2¹ = 16820017 is a prime.

It is a super-2 number, since 2×16820019² = 565826078320722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16819974 and 16820001.

It is not an unprimeable number, because it can be changed into a prime (16820017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2074 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (2033798).

Almost surely, 2^16820019 is an apocalyptic number.

16820019 is a deficient number, since it is larger than the sum of its proper divisors (7585557).

16820019 is a wasteful number, since it uses less digits than its factorization.

16820019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8466 (or 8463 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 16820019 is about 4101.2216472656. The cubic root of 16820019 is about 256.2175224356.

The spelling of 16820019 in words is "sixteen million, eight hundred twenty thousand, nineteen".