20919263 has 2 divisors, whose sum is σ = 20919264. Its totient is φ = 20919262.

The previous prime is 20919251. The next prime is 20919271. The reversal of 20919263 is 36291902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20919263 - 2¹⁰ = 20918239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20919863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10459631 + 10459632.

It is an arithmetic number, because the mean of its divisors is an integer number (10459632).

Almost surely, 2^20919263 is an apocalyptic number.

20919263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20919263 is an equidigital number, since it uses as much as digits as its factorization.

20919263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 20919263 is about 4573.7580828024. The cubic root of 20919263 is about 275.5383964763.

The spelling of 20919263 in words is "twenty million, nine hundred nineteen thousand, two hundred sixty-three".