20550036511 has 4 divisors (see below), whose sum is σ = 21631617400. Its totient is φ = 19468455624.

The previous prime is 20550036499. The next prime is 20550036517. The reversal of 20550036511 is 11563005502.

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 20550036511 - 2¹⁵ = 20550003743 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 20550036511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550036517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540790416 + ... + 540790453.

It is an arithmetic number, because the mean of its divisors is an integer number (5407904350).

Almost surely, 2^20550036511 is an apocalyptic number.

20550036511 is a deficient number, since it is larger than the sum of its proper divisors (1081580889).

20550036511 is a wasteful number, since it uses less digits than its factorization.

20550036511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081580888.

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

The spelling of 20550036511 in words is "twenty billion, five hundred fifty million, thirty-six thousand, five hundred eleven".