20765413 has 2 divisors, whose sum is σ = 20765414. Its totient is φ = 20765412.

The previous prime is 20765411. The next prime is 20765417. The reversal of 20765413 is 31456702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13890529 + 6874884 = 3727^2 + 2622^2 .

It is a cyclic number.

It is not a de Polignac number, because 20765413 - 2¹ = 20765411 is a prime.

It is a super-3 number, since 3×20765413³ (a number of 23 digits) contains 333 as substring.

Together with 20765411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20765411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382706 + 10382707.

It is an arithmetic number, because the mean of its divisors is an integer number (10382707).

Almost surely, 2^20765413 is an apocalyptic number.

It is an amenable number.

20765413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20765413 is an equidigital number, since it uses as much as digits as its factorization.

20765413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20765413 is about 4556.9082720634. The cubic root of 20765413 is about 274.8612545286.

The spelling of 20765413 in words is "twenty million, seven hundred sixty-five thousand, four hundred thirteen".