20535215131 has 4 divisors (see below), whose sum is σ = 20871858064. Its totient is φ = 20198572200.

The previous prime is 20535215111. The next prime is 20535215159. The reversal of 20535215131 is 13151253502.

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 20535215131 - 2⁷ = 20535215003 is a prime.

It is a super-2 number, since 2×20535215131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20535215131.

It is not an unprimeable number, because it can be changed into a prime (20535215111) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 168321375 + ... + 168321496.

It is an arithmetic number, because the mean of its divisors is an integer number (5217964516).

Almost surely, 2^20535215131 is an apocalyptic number.

20535215131 is a deficient number, since it is larger than the sum of its proper divisors (336642933).

20535215131 is an equidigital number, since it uses as much as digits as its factorization.

20535215131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336642932.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 20535215131 its reverse (13151253502), we get a palindrome (33686468633).

The spelling of 20535215131 in words is "twenty billion, five hundred thirty-five million, two hundred fifteen thousand, one hundred thirty-one".