20223615 has 16 divisors (see below), whose sum is σ = 32842368. Its totient is φ = 10624416.

The previous prime is 20223611. The next prime is 20223617. The reversal of 20223615 is 51632202.

It is not a de Polignac number, because 20223615 - 2² = 20223611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20223591 and 20223600.

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 15 ways as a sum of consecutive naturals, for example, 9057 + ... + 11066.

It is an arithmetic number, because the mean of its divisors is an integer number (2052648).

Almost surely, 2^20223615 is an apocalyptic number.

20223615 is a deficient number, since it is larger than the sum of its proper divisors (12618753).

20223615 is a wasteful number, since it uses less digits than its factorization.

20223615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20198.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20223615 is about 4497.0673777474. The cubic root of 20223615 is about 272.4496554302.

Adding to 20223615 its reverse (51632202), we get a palindrome (71855817).

The spelling of 20223615 in words is "twenty million, two hundred twenty-three thousand, six hundred fifteen".