20021002012 has 24 divisors (see below), whose sum is σ = 40233594240. Its totient is φ = 8621483760.

The previous prime is 20021001997. The next prime is 20021002019. The reversal of 20021002012 is 21020012002.

It is a self number, because there is not a number n which added to its sum of digits gives 20021002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021002019) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11973448 + ... + 11975119.

It is an arithmetic number, because the mean of its divisors is an integer number (1676399760).

Almost surely, 2^20021002012 is an apocalyptic number.

20021002012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20021002012 is an abundant number, since it is smaller than the sum of its proper divisors (20212592228).

20021002012 is a wasteful number, since it uses less digits than its factorization.

20021002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23948601 (or 23948599 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20021002012 its reverse (21020012002), we get a palindrome (41041014014).

The spelling of 20021002012 in words is "twenty billion, twenty-one million, two thousand, twelve".