20531503311 has 32 divisors (see below), whose sum is σ = 31471096320. Its totient is φ = 11784432000.

The previous prime is 20531503243. The next prime is 20531503319. The reversal of 20531503311 is 11330513502.

It is not a de Polignac number, because 20531503311 - 2¹⁰ = 20531502287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531503319) 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 31 ways as a sum of consecutive naturals, for example, 57256 + ... + 210573.

It is an arithmetic number, because the mean of its divisors is an integer number (983471760).

Almost surely, 2^20531503311 is an apocalyptic number.

20531503311 is a deficient number, since it is larger than the sum of its proper divisors (10939593009).

20531503311 is a wasteful number, since it uses less digits than its factorization.

20531503311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267967.

The product of its (nonzero) digits is 1350, while the sum is 24.

The spelling of 20531503311 in words is "twenty billion, five hundred thirty-one million, five hundred three thousand, three hundred eleven".