20340120457 has 2 divisors, whose sum is σ = 20340120458. Its totient is φ = 20340120456.

The previous prime is 20340120439. The next prime is 20340120467. The reversal of 20340120457 is 75402104302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17601063561 + 2739056896 = 132669^2 + 52336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20340120457 - 2¹⁹ = 20339596169 is a prime.

It is not a weakly prime, because it can be changed into another prime (20340120467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170060228 + 10170060229.

It is an arithmetic number, because the mean of its divisors is an integer number (10170060229).

Almost surely, 2^20340120457 is an apocalyptic number.

It is an amenable number.

20340120457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340120457 is an equidigital number, since it uses as much as digits as its factorization.

20340120457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

Adding to 20340120457 its reverse (75402104302), we get a palindrome (95742224759).

The spelling of 20340120457 in words is "twenty billion, three hundred forty million, one hundred twenty thousand, four hundred fifty-seven".