20636923 has 2 divisors, whose sum is σ = 20636924. Its totient is φ = 20636922.

The previous prime is 20636879. The next prime is 20636927. The reversal of 20636923 is 32963602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20636923 - 2⁹ = 20636411 is a prime.

It is not a weakly prime, because it can be changed into another prime (20636927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318461 + 10318462.

It is an arithmetic number, because the mean of its divisors is an integer number (10318462).

Almost surely, 2^20636923 is an apocalyptic number.

20636923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636923 is an equidigital number, since it uses as much as digits as its factorization.

20636923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 20636923 is about 4542.7880205882. The cubic root of 20636923 is about 274.2931621681.

The spelling of 20636923 in words is "twenty million, six hundred thirty-six thousand, nine hundred twenty-three".