20345022557 has 2 divisors, whose sum is σ = 20345022558. Its totient is φ = 20345022556.

The previous prime is 20345022539. The next prime is 20345022563. The reversal of 20345022557 is 75522054302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10227479161 + 10117543396 = 101131^2 + 100586^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345022557 - 2¹² = 20345018461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345022157) 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, 10172511278 + 10172511279.

It is an arithmetic number, because the mean of its divisors is an integer number (10172511279).

Almost surely, 2^20345022557 is an apocalyptic number.

It is an amenable number.

20345022557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345022557 is an equidigital number, since it uses as much as digits as its factorization.

20345022557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 35.

Adding to 20345022557 its reverse (75522054302), we get a palindrome (95867076859).

The spelling of 20345022557 in words is "twenty billion, three hundred forty-five million, twenty-two thousand, five hundred fifty-seven".