20427128453 has 2 divisors, whose sum is σ = 20427128454. Its totient is φ = 20427128452.

The previous prime is 20427128389. The next prime is 20427128471. The reversal of 20427128453 is 35482172402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15446015524 + 4981112929 = 124282^2 + 70577^2 .

It is a cyclic number.

It is not a de Polignac number, because 20427128453 - 2⁶ = 20427128389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20427122453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213564226 + 10213564227.

It is an arithmetic number, because the mean of its divisors is an integer number (10213564227).

Almost surely, 2^20427128453 is an apocalyptic number.

It is an amenable number.

20427128453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20427128453 is an equidigital number, since it uses as much as digits as its factorization.

20427128453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 38.

The spelling of 20427128453 in words is "twenty billion, four hundred twenty-seven million, one hundred twenty-eight thousand, four hundred fifty-three".