20269591 has 2 divisors, whose sum is σ = 20269592. Its totient is φ = 20269590.

The previous prime is 20269573. The next prime is 20269603. The reversal of 20269591 is 19596202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20269591 - 2¹⁹ = 19745303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20269541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134795 + 10134796.

It is an arithmetic number, because the mean of its divisors is an integer number (10134796).

Almost surely, 2^20269591 is an apocalyptic number.

20269591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20269591 is an equidigital number, since it uses as much as digits as its factorization.

20269591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20269591 is about 4502.1762515477. The cubic root of 20269591 is about 272.6559598766.

The spelling of 20269591 in words is "twenty million, two hundred sixty-nine thousand, five hundred ninety-one".