20861224016 has 20 divisors (see below), whose sum is σ = 40972303572. Its totient is φ = 10287726336.

The previous prime is 20861224009. The next prime is 20861224031. The reversal of 20861224016 is 61042216802.

It can be written as a sum of positive squares in 2 ways, for example, as 14932840000 + 5928384016 = 122200^2 + 76996^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8929151 + ... + 8931486.

Almost surely, 2^20861224016 is an apocalyptic number.

It is an amenable number.

20861224016 is a deficient number, since it is larger than the sum of its proper divisors (20111079556).

20861224016 is a wasteful number, since it uses less digits than its factorization.

20861224016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17860718 (or 17860712 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 20861224016 in words is "twenty billion, eight hundred sixty-one million, two hundred twenty-four thousand, sixteen".