20773637 has 2 divisors, whose sum is σ = 20773638. Its totient is φ = 20773636.

The previous prime is 20773607. The next prime is 20773651. The reversal of 20773637 is 73637702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12967201 + 7806436 = 3601^2 + 2794^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773637 - 2⁶ = 20773573 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20773597 and 20773606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20773607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386818 + 10386819.

It is an arithmetic number, because the mean of its divisors is an integer number (10386819).

Almost surely, 2^20773637 is an apocalyptic number.

It is an amenable number.

20773637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773637 is an equidigital number, since it uses as much as digits as its factorization.

20773637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37044, while the sum is 35.

The square root of 20773637 is about 4557.8105489368. The cubic root of 20773637 is about 274.8975353803.

The spelling of 20773637 in words is "twenty million, seven hundred seventy-three thousand, six hundred thirty-seven".