20055997457 has 2 divisors, whose sum is σ = 20055997458. Its totient is φ = 20055997456.

The previous prime is 20055997453. The next prime is 20055997463. The reversal of 20055997457 is 75479955002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19784110336 + 271887121 = 140656^2 + 16489^2 .

It is a cyclic number.

It is not a de Polignac number, because 20055997457 - 2² = 20055997453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20055997399 and 20055997408.

It is not a weakly prime, because it can be changed into another prime (20055997453) 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, 10027998728 + 10027998729.

It is an arithmetic number, because the mean of its divisors is an integer number (10027998729).

Almost surely, 2^20055997457 is an apocalyptic number.

It is an amenable number.

20055997457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20055997457 is an equidigital number, since it uses as much as digits as its factorization.

20055997457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3969000, while the sum is 53.

The spelling of 20055997457 in words is "twenty billion, fifty-five million, nine hundred ninety-seven thousand, four hundred fifty-seven".