20267249 has 2 divisors, whose sum is σ = 20267250. Its totient is φ = 20267248.

The previous prime is 20267239. The next prime is 20267251. The reversal of 20267249 is 94276202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11458225 + 8809024 = 3385^2 + 2968^2 .

It is a cyclic number.

It is not a de Polignac number, because 20267249 - 2¹² = 20263153 is a prime.

It is a super-2 number, since 2×20267249² = 821522764056002, which contains 22 as substring.

Together with 20267251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20267239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133624 + 10133625.

It is an arithmetic number, because the mean of its divisors is an integer number (10133625).

Almost surely, 2^20267249 is an apocalyptic number.

It is an amenable number.

20267249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20267249 is an equidigital number, since it uses as much as digits as its factorization.

20267249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20267249 is about 4501.9161475976. The cubic root of 20267249 is about 272.6454583515.

The spelling of 20267249 in words is "twenty million, two hundred sixty-seven thousand, two hundred forty-nine".