20001001002 has 16 divisors (see below), whose sum is σ = 40005652800. Its totient is φ = 6666391872.

The previous prime is 20001000977. The next prime is 20001001021. The reversal of 20001001002 is 20010010002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78127 + ... + 214722.

It is an arithmetic number, because the mean of its divisors is an integer number (2500353300).

Almost surely, 2^20001001002 is an apocalyptic number.

20001001002 is an abundant number, since it is smaller than the sum of its proper divisors (20004651798).

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

20001001002 is a wasteful number, since it uses less digits than its factorization.

20001001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304237.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20001001002 its reverse (20010010002), we get a palindrome (40011011004).

The spelling of 20001001002 in words is "twenty billion, one million, one thousand, two".