20310247 has 2 divisors, whose sum is σ = 20310248. Its totient is φ = 20310246.

The previous prime is 20310217. The next prime is 20310253. The reversal of 20310247 is 74201302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20310247 - 2⁷ = 20310119 is a prime.

It is a super-2 number, since 2×20310247² = 825012266402018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155123 + 10155124.

It is an arithmetic number, because the mean of its divisors is an integer number (10155124).

Almost surely, 2^20310247 is an apocalyptic number.

20310247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310247 is an equidigital number, since it uses as much as digits as its factorization.

20310247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20310247 is about 4506.6891394903. The cubic root of 20310247 is about 272.8381325639.

Adding to 20310247 its reverse (74201302), we get a palindrome (94511549).

The spelling of 20310247 in words is "twenty million, three hundred ten thousand, two hundred forty-seven".