20943413 has 2 divisors, whose sum is σ = 20943414. Its totient is φ = 20943412.

The previous prime is 20943401. The next prime is 20943421. The reversal of 20943413 is 31434902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11444689 + 9498724 = 3383^2 + 3082^2 .

It is a cyclic number.

It is not a de Polignac number, because 20943413 - 2⁴ = 20943397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20943493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471706 + 10471707.

It is an arithmetic number, because the mean of its divisors is an integer number (10471707).

Almost surely, 2^20943413 is an apocalyptic number.

It is an amenable number.

20943413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20943413 is an equidigital number, since it uses as much as digits as its factorization.

20943413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20943413 is about 4576.3973822211. The cubic root of 20943413 is about 275.6443864001.

The spelling of 20943413 in words is "twenty million, nine hundred forty-three thousand, four hundred thirteen".