20266949 has 2 divisors, whose sum is σ = 20266950. Its totient is φ = 20266948.

The previous prime is 20266927. The next prime is 20266951. The reversal of 20266949 is 94966202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 748225 = 4418^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 20266949 - 2⁸ = 20266693 is a prime.

Together with 20266951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20266999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133474 + 10133475.

It is an arithmetic number, because the mean of its divisors is an integer number (10133475).

Almost surely, 2^20266949 is an apocalyptic number.

It is an amenable number.

20266949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20266949 is an equidigital number, since it uses as much as digits as its factorization.

20266949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20266949 is about 4501.8828283286. The cubic root of 20266949 is about 272.6441130935.

The spelling of 20266949 in words is "twenty million, two hundred sixty-six thousand, nine hundred forty-nine".