20985754944 has 224 divisors, whose sum is σ = 72236722176. Its totient is φ = 5213767680.

The previous prime is 20985754939. The next prime is 20985754981. The reversal of 20985754944 is 44945758902.

It is a tau number, because it is divible by the number of its divisors (224).

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, 309174 + ... + 370890.

Almost surely, 2^20985754944 is an apocalyptic number.

20985754944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20985754944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36118361088).

20985754944 is an abundant number, since it is smaller than the sum of its proper divisors (51250967232).

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

20985754944 is a wasteful number, since it uses less digits than its factorization.

20985754944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61773 (or 61763 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 57.

The spelling of 20985754944 in words is "twenty billion, nine hundred eighty-five million, seven hundred fifty-four thousand, nine hundred forty-four".