20475011611 has 4 divisors (see below), whose sum is σ = 20475314424. Its totient is φ = 20474708800.

The previous prime is 20475011597. The next prime is 20475011647. The reversal of 20475011611 is 11611057402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20475011611 - 2¹¹ = 20475009563 is a prime.

It is a super-2 number, since 2×20475011611² (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 20475011611.

It is not an unprimeable number, because it can be changed into a prime (20475011651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1476 + ... + 202366.

It is an arithmetic number, because the mean of its divisors is an integer number (5118828606).

Almost surely, 2^20475011611 is an apocalyptic number.

20475011611 is a deficient number, since it is larger than the sum of its proper divisors (302813).

20475011611 is a wasteful number, since it uses less digits than its factorization.

20475011611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302812.

The product of its (nonzero) digits is 1680, while the sum is 28.

The spelling of 20475011611 in words is "twenty billion, four hundred seventy-five million, eleven thousand, six hundred eleven".