20315223 has 6 divisors (see below), whose sum is σ = 29344224. Its totient is φ = 13543476.

The previous prime is 20315219. The next prime is 20315227. The reversal of 20315223 is 32251302.

It is an interprime number because it is at equal distance from previous prime (20315219) and next prime (20315227).

It is not a de Polignac number, because 20315223 - 2² = 20315219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20315196 and 20315205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1128615 + ... + 1128632.

It is an arithmetic number, because the mean of its divisors is an integer number (4890704).

Almost surely, 2^20315223 is an apocalyptic number.

20315223 is a deficient number, since it is larger than the sum of its proper divisors (9029001).

20315223 is a wasteful number, since it uses less digits than its factorization.

20315223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257253 (or 2257250 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20315223 is about 4507.2411739333. The cubic root of 20315223 is about 272.8604124782.

Adding to 20315223 its reverse (32251302), we get a palindrome (52566525).

The spelling of 20315223 in words is "twenty million, three hundred fifteen thousand, two hundred twenty-three".