20823699773 has 4 divisors (see below), whose sum is σ = 21729078048. Its totient is φ = 19918321500.

The previous prime is 20823699739. The next prime is 20823699839. The reversal of 20823699773 is 37799632802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20823699773 - 2⁶ = 20823699709 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 (20823699703) 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, 452689103 + ... + 452689148.

It is an arithmetic number, because the mean of its divisors is an integer number (5432269512).

Almost surely, 2^20823699773 is an apocalyptic number.

20823699773 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20823699773 is a deficient number, since it is larger than the sum of its proper divisors (905378275).

20823699773 is an equidigital number, since it uses as much as digits as its factorization.

20823699773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905378274.

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 20823699773 in words is "twenty billion, eight hundred twenty-three million, six hundred ninety-nine thousand, seven hundred seventy-three".