20658223 has 2 divisors, whose sum is σ = 20658224. Its totient is φ = 20658222.

The previous prime is 20658221. The next prime is 20658229. The reversal of 20658223 is 32285602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20658223 - 2¹ = 20658221 is a prime.

Together with 20658221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20658191 and 20658200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20658221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10329111 + 10329112.

It is an arithmetic number, because the mean of its divisors is an integer number (10329112).

Almost surely, 2^20658223 is an apocalyptic number.

20658223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20658223 is an equidigital number, since it uses as much as digits as its factorization.

20658223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20658223 is about 4545.1317912685. The cubic root of 20658223 is about 274.3874985096.

The spelling of 20658223 in words is "twenty million, six hundred fifty-eight thousand, two hundred twenty-three".