20266849 has 2 divisors, whose sum is σ = 20266850. Its totient is φ = 20266848.

The previous prime is 20266847. The next prime is 20266867. The reversal of 20266849 is 94866202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 1500625 = 4332^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 20266849 - 2¹ = 20266847 is a prime.

Together with 20266847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20266847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133424 + 10133425.

It is an arithmetic number, because the mean of its divisors is an integer number (10133425).

Almost surely, 2^20266849 is an apocalyptic number.

It is an amenable number.

20266849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20266849 is an equidigital number, since it uses as much as digits as its factorization.

20266849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 20266849 is about 4501.8717218508. The cubic root of 20266849 is about 272.6436646712.

It can be divided in two parts, 20266 and 849, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20266849 in words is "twenty million, two hundred sixty-six thousand, eight hundred forty-nine".