20002002012 has 72 divisors (see below), whose sum is σ = 53519356800. Its totient is φ = 6281095968.

The previous prime is 20002001969. The next prime is 20002002089. The reversal of 20002002012 is 21020020002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20002001985 and 20002002003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40753 + ... + 204119.

It is an arithmetic number, because the mean of its divisors is an integer number (743324400).

Almost surely, 2^20002002012 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 20002002012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26759678400).

20002002012 is an abundant number, since it is smaller than the sum of its proper divisors (33517354788).

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

20002002012 is a wasteful number, since it uses less digits than its factorization.

20002002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163575 (or 163570 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20002002012 its reverse (21020020002), we get a palindrome (41022022014).

The spelling of 20002002012 in words is "twenty billion, two million, two thousand, twelve".