20806801 has 2 divisors, whose sum is σ = 20806802. Its totient is φ = 20806800.

The previous prime is 20806777. The next prime is 20806817. The reversal of 20806801 is 10860802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 9144576 = 3415^2 + 3024^2 .

It is a cyclic number.

It is not a de Polignac number, because 20806801 - 2⁵ = 20806769 is a prime.

It is not a weakly prime, because it can be changed into another prime (20806871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10403400 + 10403401.

It is an arithmetic number, because the mean of its divisors is an integer number (10403401).

Almost surely, 2^20806801 is an apocalyptic number.

It is an amenable number.

20806801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20806801 is an equidigital number, since it uses as much as digits as its factorization.

20806801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20806801 is about 4561.4472484070. The cubic root of 20806801 is about 275.0437440055.

The spelling of 20806801 in words is "twenty million, eight hundred six thousand, eight hundred one".