20636801 has 2 divisors, whose sum is σ = 20636802. Its totient is φ = 20636800.

The previous prime is 20636779. The next prime is 20636813. The reversal of 20636801 is 10863602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 1100401 = 4420^2 + 1049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20636801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20636401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318400 + 10318401.

It is an arithmetic number, because the mean of its divisors is an integer number (10318401).

Almost surely, 2^20636801 is an apocalyptic number.

It is an amenable number.

20636801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636801 is an equidigital number, since it uses as much as digits as its factorization.

20636801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20636801 is about 4542.7745926911. The cubic root of 20636801 is about 274.2926216509.

The spelling of 20636801 in words is "twenty million, six hundred thirty-six thousand, eight hundred one".