20763247 has 2 divisors, whose sum is σ = 20763248. Its totient is φ = 20763246.

The previous prime is 20763229. The next prime is 20763251. The reversal of 20763247 is 74236702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20763247 is a prime.

It is a super-2 number, since 2×20763247² = 862224851966018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20763047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10381623 + 10381624.

It is an arithmetic number, because the mean of its divisors is an integer number (10381624).

Almost surely, 2^20763247 is an apocalyptic number.

20763247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20763247 is an equidigital number, since it uses as much as digits as its factorization.

20763247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 20763247 is about 4556.6706047289. The cubic root of 20763247 is about 274.8516974479.

Adding to 20763247 its reverse (74236702), we get a palindrome (94999949).

The spelling of 20763247 in words is "twenty million, seven hundred sixty-three thousand, two hundred forty-seven".