20560247 has 2 divisors, whose sum is σ = 20560248. Its totient is φ = 20560246.

The previous prime is 20560213. The next prime is 20560273. The reversal of 20560247 is 74206502.

It is an a-pointer prime, because the next prime (20560273) can be obtained adding 20560247 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20560247 - 2⁸ = 20559991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20560207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10280123 + 10280124.

It is an arithmetic number, because the mean of its divisors is an integer number (10280124).

Almost surely, 2^20560247 is an apocalyptic number.

20560247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20560247 is an equidigital number, since it uses as much as digits as its factorization.

20560247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20560247 is about 4534.3408561774. The cubic root of 20560247 is about 273.9530306475.

Adding to 20560247 its reverse (74206502), we get a palindrome (94766749).

The spelling of 20560247 in words is "twenty million, five hundred sixty thousand, two hundred forty-seven".