20324657 has 2 divisors, whose sum is σ = 20324658. Its totient is φ = 20324656.

The previous prime is 20324653. The next prime is 20324677. The reversal of 20324657 is 75642302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 602176 = 4441^2 + 776^2 .

It is a cyclic number.

It is not a de Polignac number, because 20324657 - 2² = 20324653 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20324653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162328 + 10162329.

It is an arithmetic number, because the mean of its divisors is an integer number (10162329).

Almost surely, 2^20324657 is an apocalyptic number.

It is an amenable number.

20324657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20324657 is an equidigital number, since it uses as much as digits as its factorization.

20324657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20324657 is about 4508.2875906490. The cubic root of 20324657 is about 272.9026429896.

Adding to 20324657 its reverse (75642302), we get a palindrome (95966959).

The spelling of 20324657 in words is "twenty million, three hundred twenty-four thousand, six hundred fifty-seven".