20843273472 has 432 divisors, whose sum is σ = 67947465600. Its totient is φ = 5647810560.

The previous prime is 20843273459. The next prime is 20843273489. The reversal of 20843273472 is 27437234802.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77484154 + ... + 77484422.

It is an arithmetic number, because the mean of its divisors is an integer number (157285800).

Almost surely, 2^20843273472 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 20843273472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33973732800).

20843273472 is an abundant number, since it is smaller than the sum of its proper divisors (47104192128).

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

20843273472 is a wasteful number, since it uses less digits than its factorization.

20843273472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 42.

The spelling of 20843273472 in words is "twenty billion, eight hundred forty-three million, two hundred seventy-three thousand, four hundred seventy-two".