20400422057 has 2 divisors, whose sum is σ = 20400422058. Its totient is φ = 20400422056.

The previous prime is 20400422023. The next prime is 20400422129. The reversal of 20400422057 is 75022400402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10923594256 + 9476827801 = 104516^2 + 97349^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400422057 - 2²⁸ = 20131986601 is a prime.

It is a super-2 number, since 2×20400422057² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20400422257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200211028 + 10200211029.

It is an arithmetic number, because the mean of its divisors is an integer number (10200211029).

Almost surely, 2^20400422057 is an apocalyptic number.

It is an amenable number.

20400422057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400422057 is an equidigital number, since it uses as much as digits as its factorization.

20400422057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 26.

Adding to 20400422057 its reverse (75022400402), we get a palindrome (95422822459).

The spelling of 20400422057 in words is "twenty billion, four hundred million, four hundred twenty-two thousand, fifty-seven".