20321516777 has 8 divisors (see below), whose sum is σ = 20344296000. Its totient is φ = 20298754224.

The previous prime is 20321516749. The next prime is 20321516783. The reversal of 20321516777 is 77761512302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20321516777 - 2¹⁴ = 20321500393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321513777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6121124 + ... + 6124442.

It is an arithmetic number, because the mean of its divisors is an integer number (2543037000).

Almost surely, 2^20321516777 is an apocalyptic number.

It is an amenable number.

20321516777 is a deficient number, since it is larger than the sum of its proper divisors (22779223).

20321516777 is a wasteful number, since it uses less digits than its factorization.

20321516777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8335.

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 20321516777 in words is "twenty billion, three hundred twenty-one million, five hundred sixteen thousand, seven hundred seventy-seven".