20535240135 has 16 divisors (see below), whose sum is σ = 32924989440. Its totient is φ = 10929259680.

The previous prime is 20535240127. The next prime is 20535240137. The reversal of 20535240135 is 53104253502.

It is not a de Polignac number, because 20535240135 - 2³ = 20535240127 is a prime.

It is a super-2 number, since 2×20535240135² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535240137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1421851 + ... + 1436220.

It is an arithmetic number, because the mean of its divisors is an integer number (2057811840).

Almost surely, 2^20535240135 is an apocalyptic number.

20535240135 is a deficient number, since it is larger than the sum of its proper divisors (12389749305).

20535240135 is a wasteful number, since it uses less digits than its factorization.

20535240135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858558.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 20535240135 its reverse (53104253502), we get a palindrome (73639493637).

The spelling of 20535240135 in words is "twenty billion, five hundred thirty-five million, two hundred forty thousand, one hundred thirty-five".