20249291 has 2 divisors, whose sum is σ = 20249292. Its totient is φ = 20249290.

The previous prime is 20249267. The next prime is 20249311. The reversal of 20249291 is 19294202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20249291 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20249791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10124645 + 10124646.

It is an arithmetic number, because the mean of its divisors is an integer number (10124646).

Almost surely, 2^20249291 is an apocalyptic number.

20249291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20249291 is an equidigital number, since it uses as much as digits as its factorization.

20249291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20249291 is about 4499.9212215327. The cubic root of 20249291 is about 272.5649078050.

The spelling of 20249291 in words is "twenty million, two hundred forty-nine thousand, two hundred ninety-one".