23220247 has 2 divisors, whose sum is σ = 23220248. Its totient is φ = 23220246.

The previous prime is 23220229. The next prime is 23220259. The reversal of 23220247 is 74202232.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23220247 is a prime.

It is equal to p_1461208 and since 23220247 and 1461208 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23220277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610123 + 11610124.

It is an arithmetic number, because the mean of its divisors is an integer number (11610124).

Almost surely, 2^23220247 is an apocalyptic number.

23220247 is a deficient number, since it is larger than the sum of its proper divisors (1).

23220247 is an equidigital number, since it uses as much as digits as its factorization.

23220247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 23220247 is about 4818.7391504417. The cubic root of 23220247 is about 285.2915739697.

Adding to 23220247 its reverse (74202232), we get a palindrome (97422479).

The spelling of 23220247 in words is "twenty-three million, two hundred twenty thousand, two hundred forty-seven".