20636879 has 2 divisors, whose sum is σ = 20636880. Its totient is φ = 20636878.

The previous prime is 20636867. The next prime is 20636923. The reversal of 20636879 is 97863602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20636879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20636479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318439 + 10318440.

It is an arithmetic number, because the mean of its divisors is an integer number (10318440).

Almost surely, 2^20636879 is an apocalyptic number.

20636879 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636879 is an equidigital number, since it uses as much as digits as its factorization.

20636879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20636879 is about 4542.7831777447. The cubic root of 20636879 is about 274.2929672277.

The spelling of 20636879 in words is "twenty million, six hundred thirty-six thousand, eight hundred seventy-nine".