20021755712 has 112 divisors (see below), whose sum is σ = 48425892480. Its totient is φ = 8017477632.

The previous prime is 20021755703. The next prime is 20021755717. The reversal of 20021755712 is 21755712002.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021755717) 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 15 ways as a sum of consecutive naturals, for example, 1049168 + ... + 1068080.

It is an arithmetic number, because the mean of its divisors is an integer number (432374040).

Almost surely, 2^20021755712 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 20021755712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24212946240).

20021755712 is an abundant number, since it is smaller than the sum of its proper divisors (28404136768).

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

20021755712 is a wasteful number, since it uses less digits than its factorization.

20021755712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19088 (or 19078 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The spelling of 20021755712 in words is "twenty billion, twenty-one million, seven hundred fifty-five thousand, seven hundred twelve".