20522065691 has 4 divisors (see below), whose sum is σ = 20522354832. Its totient is φ = 20521776552.

The previous prime is 20522065637. The next prime is 20522065693. The reversal of 20522065691 is 19656022502.

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 a de Polignac number, because none of the positive numbers 2^k-20522065691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20522065693) 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, 43106 + ... + 207128.

It is an arithmetic number, because the mean of its divisors is an integer number (5130588708).

Almost surely, 2^20522065691 is an apocalyptic number.

20522065691 is a deficient number, since it is larger than the sum of its proper divisors (289141).

20522065691 is a wasteful number, since it uses less digits than its factorization.

20522065691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289140.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 20522065691 in words is "twenty billion, five hundred twenty-two million, sixty-five thousand, six hundred ninety-one".