20747263 has 2 divisors, whose sum is σ = 20747264. Its totient is φ = 20747262.

The previous prime is 20747239. The next prime is 20747273. The reversal of 20747263 is 36274702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20747263 - 2⁵ = 20747231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20747203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373631 + 10373632.

It is an arithmetic number, because the mean of its divisors is an integer number (10373632).

Almost surely, 2^20747263 is an apocalyptic number.

20747263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747263 is an equidigital number, since it uses as much as digits as its factorization.

20747263 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 20747263 is about 4554.9163548851. The cubic root of 20747263 is about 274.7811503999.

The spelling of 20747263 in words is "twenty million, seven hundred forty-seven thousand, two hundred sixty-three".