20967537811 has 4 divisors (see below), whose sum is σ = 22873677624. Its totient is φ = 19061398000.

The previous prime is 20967537803. The next prime is 20967537827. The reversal of 20967537811 is 11873576902.

It is a happy number.

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 20967537811 - 2³ = 20967537803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20967537841) 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, 953069890 + ... + 953069911.

It is an arithmetic number, because the mean of its divisors is an integer number (5718419406).

Almost surely, 2^20967537811 is an apocalyptic number.

20967537811 is a deficient number, since it is larger than the sum of its proper divisors (1906139813).

20967537811 is a wasteful number, since it uses less digits than its factorization.

20967537811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906139812.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 20967537811 in words is "twenty billion, nine hundred sixty-seven million, five hundred thirty-seven thousand, eight hundred eleven".