20323229 has 4 divisors (see below), whose sum is σ = 21024060. Its totient is φ = 19622400.

The previous prime is 20323201. The next prime is 20323267. The reversal of 20323229 is 92232302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9597604 + 10725625 = 3098^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323229 - 2¹² = 20319133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323529) 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, 350372 + ... + 350429.

It is an arithmetic number, because the mean of its divisors is an integer number (5256015).

Almost surely, 2^20323229 is an apocalyptic number.

20323229 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20323229 is a deficient number, since it is larger than the sum of its proper divisors (700831).

20323229 is an equidigital number, since it uses as much as digits as its factorization.

20323229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700830.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20323229 is about 4508.1292128776. The cubic root of 20323229 is about 272.8962515066.

It can be divided in two parts, 203 and 23229, that added together give a palindrome (23432).

The spelling of 20323229 in words is "twenty million, three hundred twenty-three thousand, two hundred twenty-nine".