20939263 has 2 divisors, whose sum is σ = 20939264. Its totient is φ = 20939262.

The previous prime is 20939251. The next prime is 20939267. The reversal of 20939263 is 36293902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20939263 - 2⁵ = 20939231 is a prime.

It is a zygodrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20939267) 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, 10469631 + 10469632.

It is an arithmetic number, because the mean of its divisors is an integer number (10469632).

Almost surely, 2^20939263 is an apocalyptic number.

20939263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20939263 is an equidigital number, since it uses as much as digits as its factorization.

20939263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 20939263 is about 4575.9439463350. The cubic root of 20939263 is about 275.6261786105.

The spelling of 20939263 in words is "twenty million, nine hundred thirty-nine thousand, two hundred sixty-three".