20006811 has 64 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 11232000.

The previous prime is 20006801. The next prime is 20006813. The reversal of 20006811 is 11860002.

It is not a de Polignac number, because 20006811 - 2⁷ = 20006683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20006813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 377461 + ... + 377513.

It is an arithmetic number, because the mean of its divisors is an integer number (544320).

Almost surely, 2^20006811 is an apocalyptic number.

20006811 is a deficient number, since it is larger than the sum of its proper divisors (14829669).

20006811 is a wasteful number, since it uses less digits than its factorization.

20006811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 139 counting only the distinct ones).

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

The square root of 20006811 is about 4472.8973831287. The cubic root of 20006811 is about 271.4725713263.

Adding to 20006811 its reverse (11860002), we get a palindrome (31866813).

The spelling of 20006811 in words is "twenty million, six thousand, eight hundred eleven".