20043421056 has 256 divisors, whose sum is σ = 62868312000. Its totient is φ = 6264815616.

The previous prime is 20043421037. The next prime is 20043421067. The reversal of 20043421056 is 65012434002.

20043421056 is a `hidden beast` number, since 200 + 434 + 21 + 0 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22854090 + ... + 22854966.

Almost surely, 2^20043421056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20043421056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31434156000).

20043421056 is an abundant number, since it is smaller than the sum of its proper divisors (42824890944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20043421056 is a wasteful number, since it uses less digits than its factorization.

20043421056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 20043421056 its reverse (65012434002), we get a palindrome (85055855058).

The spelling of 20043421056 in words is "twenty billion, forty-three million, four hundred twenty-one thousand, fifty-six".