20006851 has 2 divisors, whose sum is σ = 20006852. Its totient is φ = 20006850.

The previous prime is 20006843. The next prime is 20006869. The reversal of 20006851 is 15860002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20006851 - 2³ = 20006843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20006801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10003425 + 10003426.

It is an arithmetic number, because the mean of its divisors is an integer number (10003426).

Almost surely, 2^20006851 is an apocalyptic number.

20006851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20006851 is an equidigital number, since it uses as much as digits as its factorization.

20006851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20006851 is about 4472.9018545012. The cubic root of 20006851 is about 271.4727522463.

Adding to 20006851 its reverse (15860002), we get a palindrome (35866853).

The spelling of 20006851 in words is "twenty million, six thousand, eight hundred fifty-one".