20485497312 has 144 divisors (see below), whose sum is σ = 66917122272. Its totient is φ = 5823175680.

The previous prime is 20485497299. The next prime is 20485497313. The reversal of 20485497312 is 21379458402.

20485497312 is a `hidden beast` number, since 20 + 4 + 8 + 549 + 73 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20485497313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371362 + ... + 422942.

It is an arithmetic number, because the mean of its divisors is an integer number (464702238).

Almost surely, 2^20485497312 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 20485497312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33458561136).

20485497312 is an abundant number, since it is smaller than the sum of its proper divisors (46431624960).

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

20485497312 is a wasteful number, since it uses less digits than its factorization.

20485497312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51801 (or 51790 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20485497312 in words is "twenty billion, four hundred eighty-five million, four hundred ninety-seven thousand, three hundred twelve".