20715223 has 12 divisors (see below), whose sum is σ = 21867328. Its totient is φ = 19601280.

The previous prime is 20715221. The next prime is 20715239. The reversal of 20715223 is 32251702.

It is not a de Polignac number, because 20715223 - 2¹ = 20715221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20715194 and 20715203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20715221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213511 + ... + 213607.

Almost surely, 2^20715223 is an apocalyptic number.

20715223 is a deficient number, since it is larger than the sum of its proper divisors (1152105).

20715223 is an frugal number, since it uses more digits than its factorization.

20715223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20715223 is about 4551.3979171239. The cubic root of 20715223 is about 274.6396293400.

Adding to 20715223 its reverse (32251702), we get a palindrome (52966925).

The spelling of 20715223 in words is "twenty million, seven hundred fifteen thousand, two hundred twenty-three".