20266613 has 2 divisors, whose sum is σ = 20266614. Its totient is φ = 20266612.

The previous prime is 20266607. The next prime is 20266633. The reversal of 20266613 is 31666202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11546404 + 8720209 = 3398^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 20266613 - 2¹⁰ = 20265589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20266633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133306 + 10133307.

It is an arithmetic number, because the mean of its divisors is an integer number (10133307).

Almost surely, 2^20266613 is an apocalyptic number.

It is an amenable number.

20266613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20266613 is an equidigital number, since it uses as much as digits as its factorization.

20266613 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 26.

The square root of 20266613 is about 4501.8455104546. The cubic root of 20266613 is about 272.6426063887.

The spelling of 20266613 in words is "twenty million, two hundred sixty-six thousand, six hundred thirteen".