20031001002 has 64 divisors (see below), whose sum is σ = 45171352320. Its totient is φ = 6578496000.

The previous prime is 20031000989. The next prime is 20031001007. The reversal of 20031001002 is 20010013002.

It is a happy number.

It is a super-2 number, since 2×20031001002² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20031001007) 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 31 ways as a sum of consecutive naturals, for example, 4732227 + ... + 4736457.

It is an arithmetic number, because the mean of its divisors is an integer number (705802380).

Almost surely, 2^20031001002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20031001002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22585676160).

20031001002 is an abundant number, since it is smaller than the sum of its proper divisors (25140351318).

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

20031001002 is a wasteful number, since it uses less digits than its factorization.

20031001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516 (or 5510 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20031001002 its reverse (20010013002), we get a palindrome (40041014004).

The spelling of 20031001002 in words is "twenty billion, thirty-one million, one thousand, two".