20340431077 has 2 divisors, whose sum is σ = 20340431078. Its totient is φ = 20340431076.

The previous prime is 20340431003. The next prime is 20340431093. The reversal of 20340431077 is 77013404302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20256690276 + 83740801 = 142326^2 + 9151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20340431077 - 2¹¹ = 20340429029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340471077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170215538 + 10170215539.

It is an arithmetic number, because the mean of its divisors is an integer number (10170215539).

Almost surely, 2^20340431077 is an apocalyptic number.

It is an amenable number.

20340431077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340431077 is an equidigital number, since it uses as much as digits as its factorization.

20340431077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 31.

Adding to 20340431077 its reverse (77013404302), we get a palindrome (97353835379).

The spelling of 20340431077 in words is "twenty billion, three hundred forty million, four hundred thirty-one thousand, seventy-seven".