20127535438 has 4 divisors (see below), whose sum is σ = 30191303160. Its totient is φ = 10063767718.

The previous prime is 20127535409. The next prime is 20127535457. The reversal of 20127535438 is 83453572102.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20127535438.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5031883858 + ... + 5031883861.

It is an arithmetic number, because the mean of its divisors is an integer number (7547825790).

Almost surely, 2^20127535438 is an apocalyptic number.

20127535438 is a deficient number, since it is larger than the sum of its proper divisors (10063767722).

20127535438 is a wasteful number, since it uses less digits than its factorization.

20127535438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10063767721.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 20127535438 in words is "twenty billion, one hundred twenty-seven million, five hundred thirty-five thousand, four hundred thirty-eight".