20321056016357 has 4 divisors (see below), whose sum is σ = 20324149500780. Its totient is φ = 20317962531936.

The previous prime is 20321056016347. The next prime is 20321056016389. The reversal of 20321056016357 is 75361065012302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15057147165316 + 5263908851041 = 3880354^2 + 2294321^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321056016357 - 2⁶ = 20321056016293 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 (20321056016347) 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, 1546732358 + ... + 1546745495.

It is an arithmetic number, because the mean of its divisors is an integer number (5081037375195).

Almost surely, 2^{20321056016357} is an apocalyptic number.

It is an amenable number.

20321056016357 is a deficient number, since it is larger than the sum of its proper divisors (3093484423).

20321056016357 is an equidigital number, since it uses as much as digits as its factorization.

20321056016357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093484422.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 20321056016357 in words is "twenty trillion, three hundred twenty-one billion, fifty-six million, sixteen thousand, three hundred fifty-seven".