20415223 has 4 divisors (see below), whose sum is σ = 20445048. Its totient is φ = 20385400.

The previous prime is 20415221. The next prime is 20415233. The reversal of 20415223 is 32251402.

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

It is a cyclic number.

It is not a de Polignac number, because 20415223 - 2¹ = 20415221 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 20415223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415221) 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, 13861 + ... + 15262.

It is an arithmetic number, because the mean of its divisors is an integer number (5111262).

Almost surely, 2^20415223 is an apocalyptic number.

20415223 is a deficient number, since it is larger than the sum of its proper divisors (29825).

20415223 is an equidigital number, since it uses as much as digits as its factorization.

20415223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29824.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20415223 is about 4518.3208164096. The cubic root of 20415223 is about 273.3073907892.

Adding to 20415223 its reverse (32251402), we get a palindrome (52666625).

The spelling of 20415223 in words is "twenty million, four hundred fifteen thousand, two hundred twenty-three".