20434255157 has 2 divisors, whose sum is σ = 20434255158. Its totient is φ = 20434255156.

The previous prime is 20434255141. The next prime is 20434255159. The reversal of 20434255157 is 75155243402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11927697796 + 8506557361 = 109214^2 + 92231^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434255157 - 2⁴ = 20434255141 is a prime.

Together with 20434255159, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20434255157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20434255159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217127578 + 10217127579.

It is an arithmetic number, because the mean of its divisors is an integer number (10217127579).

Almost surely, 2^20434255157 is an apocalyptic number.

It is an amenable number.

20434255157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434255157 is an equidigital number, since it uses as much as digits as its factorization.

20434255157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168000, while the sum is 38.

Adding to 20434255157 its reverse (75155243402), we get a palindrome (95589498559).

The spelling of 20434255157 in words is "twenty billion, four hundred thirty-four million, two hundred fifty-five thousand, one hundred fifty-seven".