20550234157 has 2 divisors, whose sum is σ = 20550234158. Its totient is φ = 20550234156.

The previous prime is 20550234119. The next prime is 20550234179. The reversal of 20550234157 is 75143205502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11293100361 + 9257133796 = 106269^2 + 96214^2 .

It is a cyclic number.

It is not a de Polignac number, because 20550234157 - 2¹⁵ = 20550201389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20550234197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275117078 + 10275117079.

It is an arithmetic number, because the mean of its divisors is an integer number (10275117079).

Almost surely, 2^20550234157 is an apocalyptic number.

It is an amenable number.

20550234157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20550234157 is an equidigital number, since it uses as much as digits as its factorization.

20550234157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42000, while the sum is 34.

Adding to 20550234157 its reverse (75143205502), we get a palindrome (95693439659).

The spelling of 20550234157 in words is "twenty billion, five hundred fifty million, two hundred thirty-four thousand, one hundred fifty-seven".