20447856016 has 45 divisors (see below), whose sum is σ = 46094946219. Its totient is φ = 8761650912.

The previous prime is 20447855977. The next prime is 20447856019. The reversal of 20447856016 is 61065874402.

The square root of 20447856016 is 142996.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×20447856016² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20447856019) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 4001335 + ... + 4006441.

Almost surely, 2^20447856016 is an apocalyptic number.

20447856016 is the 142996-th square number.

It is an amenable number.

20447856016 is an abundant number, since it is smaller than the sum of its proper divisors (25647090203).

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

20447856016 is an frugal number, since it uses more digits than its factorization.

20447856016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10236 (or 5116 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 20447856016 in words is "twenty billion, four hundred forty-seven million, eight hundred fifty-six thousand, sixteen".