20021600056 has 48 divisors (see below), whose sum is σ = 40029323040. Its totient is φ = 9386012160.

The previous prime is 20021600047. The next prime is 20021600059. The reversal of 20021600056 is 65000612002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021600059) 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 11 ways as a sum of consecutive naturals, for example, 244401 + ... + 315871.

It is an arithmetic number, because the mean of its divisors is an integer number (833944230).

Almost surely, 2^20021600056 is an apocalyptic number.

It is an amenable number.

20021600056 is a deficient number, since it is larger than the sum of its proper divisors (20007722984).

20021600056 is a wasteful number, since it uses less digits than its factorization.

20021600056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71612 (or 71589 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The spelling of 20021600056 in words is "twenty billion, twenty-one million, six hundred thousand, fifty-six".