20644143053 has 2 divisors, whose sum is σ = 20644143054. Its totient is φ = 20644143052.

The previous prime is 20644142977. The next prime is 20644143067. The reversal of 20644143053 is 35034144602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12642303844 + 8001839209 = 112438^2 + 89453^2 .

It is a cyclic number.

It is not a de Polignac number, because 20644143053 - 2¹⁴ = 20644126669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20644143073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322071526 + 10322071527.

It is an arithmetic number, because the mean of its divisors is an integer number (10322071527).

Almost surely, 2^20644143053 is an apocalyptic number.

It is an amenable number.

20644143053 is a deficient number, since it is larger than the sum of its proper divisors (1).

20644143053 is an equidigital number, since it uses as much as digits as its factorization.

20644143053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 20644143053 its reverse (35034144602), we get a palindrome (55678287655).

The spelling of 20644143053 in words is "twenty billion, six hundred forty-four million, one hundred forty-three thousand, fifty-three".