20512223 has 2 divisors, whose sum is σ = 20512224. Its totient is φ = 20512222.

The previous prime is 20512213. The next prime is 20512241. The reversal of 20512223 is 32221502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20512223 - 2¹⁶ = 20446687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20512213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256111 + 10256112.

It is an arithmetic number, because the mean of its divisors is an integer number (10256112).

Almost surely, 2^20512223 is an apocalyptic number.

20512223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512223 is an equidigital number, since it uses as much as digits as its factorization.

20512223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20512223 is about 4529.0421724687. The cubic root of 20512223 is about 273.7395673067.

Adding to 20512223 its reverse (32221502), we get a palindrome (52733725).

The spelling of 20512223 in words is "twenty million, five hundred twelve thousand, two hundred twenty-three".