20021118016 has 63 divisors (see below), whose sum is σ = 41585952261. Its totient is φ = 9562865664.

The previous prime is 20021118011. The next prime is 20021118023. The reversal of 20021118016 is 61081112002.

The square root of 20021118016 is 141496.

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

It can be written as a sum of positive squares in only one way, i.e., 7832958016 + 12188160000 = 88504^2 + 110400^2 .

It is a super-2 number, since 2×20021118016² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021118011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26034880 + ... + 26035648.

Almost surely, 2^20021118016 is an apocalyptic number.

20021118016 is the 141496-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021118016

20021118016 is an abundant number, since it is smaller than the sum of its proper divisors (21564834245).

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

20021118016 is an frugal number, since it uses more digits than its factorization.

20021118016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 22.

The spelling of 20021118016 in words is "twenty billion, twenty-one million, one hundred eighteen thousand, sixteen".