20020021008 has 320 divisors, whose sum is σ = 60836106240. Its totient is φ = 5621704704.

The previous prime is 20020020997. The next prime is 20020021009. The reversal of 20020021008 is 80012002002.

It is a super-2 number, since 2×20020021008² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20020021009) 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 63 ways as a sum of consecutive naturals, for example, 42869191 + ... + 42869657.

It is an arithmetic number, because the mean of its divisors is an integer number (190112832).

Almost surely, 2^20020021008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20020021008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30418053120).

20020021008 is an abundant number, since it is smaller than the sum of its proper divisors (40816085232).

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

20020021008 is a wasteful number, since it uses less digits than its factorization.

20020021008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The spelling of 20020021008 in words is "twenty billion, twenty million, twenty-one thousand, eight".