20962813 has 2 divisors, whose sum is σ = 20962814. Its totient is φ = 20962812.

The previous prime is 20962811. The next prime is 20962817. The reversal of 20962813 is 31826902.

20962813 = 3237² + 3238².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10484644 + 10478169 = 3238^2 + 3237^2 .

It is a cyclic number.

It is not a de Polignac number, because 20962813 - 2¹ = 20962811 is a prime.

Together with 20962811, 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 (20962811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481406 + 10481407.

It is an arithmetic number, because the mean of its divisors is an integer number (10481407).

Almost surely, 2^20962813 is an apocalyptic number.

20962813 is the 3238-th centered square number.

It is an amenable number.

20962813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20962813 is an equidigital number, since it uses as much as digits as its factorization.

20962813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20962813 is about 4578.5164627857. The cubic root of 20962813 is about 275.7294704438.

The spelling of 20962813 in words is "twenty million, nine hundred sixty-two thousand, eight hundred thirteen".