20447356888 has 64 divisors (see below), whose sum is σ = 45378792000. Its totient is φ = 8451244032.

The previous prime is 20447356847. The next prime is 20447356903. The reversal of 20447356888 is 88865374402.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1501920 + ... + 1515472.

It is an arithmetic number, because the mean of its divisors is an integer number (709043625).

Almost surely, 2^20447356888 is an apocalyptic number.

20447356888 is a gapful number since it is divisible by the number (28) 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 20447356888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22689396000).

20447356888 is an abundant number, since it is smaller than the sum of its proper divisors (24931435112).

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

20447356888 is a wasteful number, since it uses less digits than its factorization.

20447356888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14524 (or 14520 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 55.

The spelling of 20447356888 in words is "twenty billion, four hundred forty-seven million, three hundred fifty-six thousand, eight hundred eighty-eight".