20535142139 has 4 divisors (see below), whose sum is σ = 20738460480. Its totient is φ = 20331823800.

The previous prime is 20535142123. The next prime is 20535142151. The reversal of 20535142139 is 93124153502.

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

It is a cyclic number.

It is not a de Polignac number, because 20535142139 - 2⁴ = 20535142123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20535142099 and 20535142108.

It is not an unprimeable number, because it can be changed into a prime (20535142939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101659019 + ... + 101659220.

It is an arithmetic number, because the mean of its divisors is an integer number (5184615120).

Almost surely, 2^20535142139 is an apocalyptic number.

20535142139 is a deficient number, since it is larger than the sum of its proper divisors (203318341).

20535142139 is a wasteful number, since it uses less digits than its factorization.

20535142139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203318340.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 20535142139 in words is "twenty billion, five hundred thirty-five million, one hundred forty-two thousand, one hundred thirty-nine".