20969413 has 2 divisors, whose sum is σ = 20969414. Its totient is φ = 20969412.

The previous prime is 20969411. The next prime is 20969419. The reversal of 20969413 is 31496902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15507844 + 5461569 = 3938^2 + 2337^2 .

It is a cyclic number.

It is not a de Polignac number, because 20969413 - 2¹ = 20969411 is a prime.

Together with 20969411, 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 (20969411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484706 + 10484707.

It is an arithmetic number, because the mean of its divisors is an integer number (10484707).

Almost surely, 2^20969413 is an apocalyptic number.

It is an amenable number.

20969413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20969413 is an equidigital number, since it uses as much as digits as its factorization.

20969413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20969413 is about 4579.2371635459. The cubic root of 20969413 is about 275.7584045943.

The spelling of 20969413 in words is "twenty million, nine hundred sixty-nine thousand, four hundred thirteen".