20967913823 has 4 divisors (see below), whose sum is σ = 21055645920. Its totient is φ = 20880181728.

The previous prime is 20967913763. The next prime is 20967913843. The reversal of 20967913823 is 32831976902.

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 20967913823 - 2¹⁴ = 20967897439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20967913843) 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, 43865690 + ... + 43866167.

It is an arithmetic number, because the mean of its divisors is an integer number (5263911480).

Almost surely, 2^20967913823 is an apocalyptic number.

20967913823 is a deficient number, since it is larger than the sum of its proper divisors (87732097).

20967913823 is an equidigital number, since it uses as much as digits as its factorization.

20967913823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87732096.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 20967913823 in words is "twenty billion, nine hundred sixty-seven million, nine hundred thirteen thousand, eight hundred twenty-three".