20127535409 has 2 divisors, whose sum is σ = 20127535410. Its totient is φ = 20127535408.

The previous prime is 20127535381. The next prime is 20127535457. The reversal of 20127535409 is 90453572102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19811407009 + 316128400 = 140753^2 + 17780^2 .

It is a cyclic number.

It is not a de Polignac number, because 20127535409 - 2¹² = 20127531313 is a prime.

It is not a weakly prime, because it can be changed into another prime (20127535709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063767704 + 10063767705.

It is an arithmetic number, because the mean of its divisors is an integer number (10063767705).

Almost surely, 2^20127535409 is an apocalyptic number.

It is an amenable number.

20127535409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20127535409 is an equidigital number, since it uses as much as digits as its factorization.

20127535409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 20127535409 in words is "twenty billion, one hundred twenty-seven million, five hundred thirty-five thousand, four hundred nine".