20640035611 has 8 divisors (see below), whose sum is σ = 22559488784. Its totient is φ = 18767976480.

The previous prime is 20640035599. The next prime is 20640035627. The reversal of 20640035611 is 11653004602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20640035611 - 2¹¹ = 20640033563 is a prime.

It is a super-2 number, since 2×20640035611² (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 20640035611.

It is not an unprimeable number, because it can be changed into a prime (20640035641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11847600 + ... + 11849341.

It is an arithmetic number, because the mean of its divisors is an integer number (2819936098).

Almost surely, 2^20640035611 is an apocalyptic number.

20640035611 is a deficient number, since it is larger than the sum of its proper divisors (1919453173).

20640035611 is a wasteful number, since it uses less digits than its factorization.

20640035611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23697021.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 20640035611 in words is "twenty billion, six hundred forty million, thirty-five thousand, six hundred eleven".