20147597 has 2 divisors, whose sum is σ = 20147598. Its totient is φ = 20147596.

The previous prime is 20147587. The next prime is 20147623. The reversal of 20147597 is 79574102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18957316 + 1190281 = 4354^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 20147597 - 2⁸ = 20147341 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20147587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073798 + 10073799.

It is an arithmetic number, because the mean of its divisors is an integer number (10073799).

Almost surely, 2^20147597 is an apocalyptic number.

It is an amenable number.

20147597 is a deficient number, since it is larger than the sum of its proper divisors (1).

20147597 is an equidigital number, since it uses as much as digits as its factorization.

20147597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 20147597 is about 4488.6074678011. The cubic root of 20147597 is about 272.1078589324.

The spelling of 20147597 in words is "twenty million, one hundred forty-seven thousand, five hundred ninety-seven".