20320024457 has 2 divisors, whose sum is σ = 20320024458. Its totient is φ = 20320024456.

The previous prime is 20320024441. The next prime is 20320024481. The reversal of 20320024457 is 75442002302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19214395456 + 1105629001 = 138616^2 + 33251^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320024457 - 2⁴ = 20320024441 is a prime.

It is not a weakly prime, because it can be changed into another prime (20320024357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160012228 + 10160012229.

It is an arithmetic number, because the mean of its divisors is an integer number (10160012229).

Almost surely, 2^20320024457 is an apocalyptic number.

It is an amenable number.

20320024457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320024457 is an equidigital number, since it uses as much as digits as its factorization.

20320024457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 29.

Adding to 20320024457 its reverse (75442002302), we get a palindrome (95762026759).

The spelling of 20320024457 in words is "twenty billion, three hundred twenty million, twenty-four thousand, four hundred fifty-seven".