20136223 has 4 divisors (see below), whose sum is σ = 20324520. Its totient is φ = 19947928.

The previous prime is 20136217. The next prime is 20136227. The reversal of 20136223 is 32263102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20136223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20136223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20136227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93988 + ... + 94201.

It is an arithmetic number, because the mean of its divisors is an integer number (5081130).

Almost surely, 2^20136223 is an apocalyptic number.

20136223 is a deficient number, since it is larger than the sum of its proper divisors (188297).

20136223 is a wasteful number, since it uses less digits than its factorization.

20136223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188296.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20136223 is about 4487.3403035651. The cubic root of 20136223 is about 272.0566445970.

Adding to 20136223 its reverse (32263102), we get a palindrome (52399325).

The spelling of 20136223 in words is "twenty million, one hundred thirty-six thousand, two hundred twenty-three".