20545623072 has 144 divisors (see below), whose sum is σ = 63174541248. Its totient is φ = 6296256000.

The previous prime is 20545623013. The next prime is 20545623143. The reversal of 20545623072 is 27032654502.

20545623072 is a `hidden beast` number, since 20 + 5 + 4 + 5 + 623 + 0 + 7 + 2 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 928813 + ... + 950675.

It is an arithmetic number, because the mean of its divisors is an integer number (438712092).

Almost surely, 2^20545623072 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 20545623072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31587270624).

20545623072 is an abundant number, since it is smaller than the sum of its proper divisors (42628918176).

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

20545623072 is a wasteful number, since it uses less digits than its factorization.

20545623072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22143 (or 22132 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 36.

The spelling of 20545623072 in words is "twenty billion, five hundred forty-five million, six hundred twenty-three thousand, seventy-two".