20943737 has 2 divisors, whose sum is σ = 20943738. Its totient is φ = 20943736.

The previous prime is 20943721. The next prime is 20943749. The reversal of 20943737 is 73734902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 657721 = 4504^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 20943737 - 2⁴ = 20943721 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20943697 and 20943706.

It is not a weakly prime, because it can be changed into another prime (20943787) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471868 + 10471869.

It is an arithmetic number, because the mean of its divisors is an integer number (10471869).

Almost surely, 2^20943737 is an apocalyptic number.

It is an amenable number.

20943737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20943737 is an equidigital number, since it uses as much as digits as its factorization.

20943737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 20943737 is about 4576.4327811080. The cubic root of 20943737 is about 275.6458078227.

The spelling of 20943737 in words is "twenty million, nine hundred forty-three thousand, seven hundred thirty-seven".