20816001 has 16 divisors (see below), whose sum is σ = 32462400. Its totient is φ = 13146624.

The previous prime is 20815981. The next prime is 20816009. The reversal of 20816001 is 10061802.

It is not a de Polignac number, because 20816001 - 2⁵ = 20815969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20816009) 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, 19776 + ... + 20801.

It is an arithmetic number, because the mean of its divisors is an integer number (2028900).

Almost surely, 2^20816001 is an apocalyptic number.

It is an amenable number.

20816001 is a deficient number, since it is larger than the sum of its proper divisors (11646399).

20816001 is a wasteful number, since it uses less digits than its factorization.

20816001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40605 (or 40599 counting only the distinct ones).

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

The square root of 20816001 is about 4562.4555888249. The cubic root of 20816001 is about 275.0842760986.

Adding to 20816001 its reverse (10061802), we get a palindrome (30877803).

The spelling of 20816001 in words is "twenty million, eight hundred sixteen thousand, one".