20215535311 has 4 divisors (see below), whose sum is σ = 20228404824. Its totient is φ = 20202665800.

The previous prime is 20215535281. The next prime is 20215535323. The reversal of 20215535311 is 11353551202.

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 20215535311 - 2⁷ = 20215535183 is a prime.

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 20215535311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215535411) 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, 6432400 + ... + 6435541.

It is an arithmetic number, because the mean of its divisors is an integer number (5057101206).

Almost surely, 2^20215535311 is an apocalyptic number.

20215535311 is a deficient number, since it is larger than the sum of its proper divisors (12869513).

20215535311 is a wasteful number, since it uses less digits than its factorization.

20215535311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12869512.

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

The spelling of 20215535311 in words is "twenty billion, two hundred fifteen million, five hundred thirty-five thousand, three hundred eleven".