16820001 has 16 divisors (see below), whose sum is σ = 27184320. Its totient is φ = 10193760.

The previous prime is 16819993. The next prime is 16820017. The reversal of 16820001 is 10002861.

It is not a de Polignac number, because 16820001 - 2³ = 16819993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16820071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28020 + ... + 28613.

It is an arithmetic number, because the mean of its divisors is an integer number (1699020).

Almost surely, 2^16820001 is an apocalyptic number.

16820001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16820001 is a deficient number, since it is larger than the sum of its proper divisors (10364319).

16820001 is a wasteful number, since it uses less digits than its factorization.

16820001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56653 (or 56647 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 16820001 is about 4101.2194527969. The cubic root of 16820001 is about 256.2174310382.

Adding to 16820001 its reverse (10002861), we get a palindrome (26822862).

The spelling of 16820001 in words is "sixteen million, eight hundred twenty thousand, one".