20223613 has 4 divisors (see below), whose sum is σ = 20245788. Its totient is φ = 20201440.

The previous prime is 20223611. The next prime is 20223617. The reversal of 20223613 is 31632202.

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 15038884 + 5184729 = 3878^2 + 2277^2 .

It is a cyclic number.

It is not a de Polignac number, because 20223613 - 2¹ = 20223611 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 (20223611) 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, 9658 + ... + 11563.

It is an arithmetic number, because the mean of its divisors is an integer number (5061447).

Almost surely, 2^20223613 is an apocalyptic number.

It is an amenable number.

20223613 is a deficient number, since it is larger than the sum of its proper divisors (22175).

20223613 is an equidigital number, since it uses as much as digits as its factorization.

20223613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22174.

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

The square root of 20223613 is about 4497.0671553803. The cubic root of 20223613 is about 272.4496464489.

Adding to 20223613 its reverse (31632202), we get a palindrome (51855815).

The spelling of 20223613 in words is "twenty million, two hundred twenty-three thousand, six hundred thirteen".