20173697 has 2 divisors, whose sum is σ = 20173698. Its totient is φ = 20173696.

The previous prime is 20173663. The next prime is 20173709. The reversal of 20173697 is 79637102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 2876416 = 4159^2 + 1696^2 .

It is a cyclic number.

It is not a de Polignac number, because 20173697 - 2¹² = 20169601 is a prime.

It is not a weakly prime, because it can be changed into another prime (20173397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086848 + 10086849.

It is an arithmetic number, because the mean of its divisors is an integer number (10086849).

Almost surely, 2^20173697 is an apocalyptic number.

It is an amenable number.

20173697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20173697 is an equidigital number, since it uses as much as digits as its factorization.

20173697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20173697 is about 4491.5138873213. The cubic root of 20173697 is about 272.2253080188.

The spelling of 20173697 in words is "twenty million, one hundred seventy-three thousand, six hundred ninety-seven".