20447645526 has 144 divisors (see below), whose sum is σ = 58928137632. Its totient is φ = 4998597120.

The previous prime is 20447645447. The next prime is 20447645527. The reversal of 20447645526 is 62554674402.

20447645526 is a `hidden beast` number, since 20 + 4 + 4 + 76 + 4 + 552 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447645527) 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 71 ways as a sum of consecutive naturals, for example, 219736 + ... + 298628.

It is an arithmetic number, because the mean of its divisors is an integer number (409223178).

Almost surely, 2^20447645526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20447645526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29464068816).

20447645526 is an abundant number, since it is smaller than the sum of its proper divisors (38480492106).

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

20447645526 is a wasteful number, since it uses less digits than its factorization.

20447645526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78947 (or 78933 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 45.

The spelling of 20447645526 in words is "twenty billion, four hundred forty-seven million, six hundred forty-five thousand, five hundred twenty-six".