20175997 has 2 divisors, whose sum is σ = 20175998. Its totient is φ = 20175996.

The previous prime is 20175983. The next prime is 20176003. The reversal of 20175997 is 79957102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 1331716 = 4341^2 + 1154^2 .

It is a cyclic number.

It is not a de Polignac number, because 20175997 - 2¹¹ = 20173949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20173997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10087998 + 10087999.

It is an arithmetic number, because the mean of its divisors is an integer number (10087999).

Almost surely, 2^20175997 is an apocalyptic number.

It is an amenable number.

20175997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20175997 is an equidigital number, since it uses as much as digits as its factorization.

20175997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 20175997 is about 4491.7699184175. The cubic root of 20175997 is about 272.2356530804.

The spelling of 20175997 in words is "twenty million, one hundred seventy-five thousand, nine hundred ninety-seven".