20021002002 has 72 divisors (see below), whose sum is σ = 45406136412. Its totient is φ = 6371846400.

The previous prime is 20021001997. The next prime is 20021002019. The reversal of 20021002002 is 20020012002.

It can be written as a sum of positive squares in 2 ways, for example, as 19920781881 + 100220121 = 141141^2 + 10011^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1624102 + ... + 1636382.

Almost surely, 2^20021002002 is an apocalyptic number.

20021002002 is an abundant number, since it is smaller than the sum of its proper divisors (25385134410).

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

20021002002 is a wasteful number, since it uses less digits than its factorization.

20021002002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12424 (or 12374 counting only the distinct ones).

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

Adding to 20021002002 its reverse (20020012002), we get a palindrome (40041014004).

It can be divided in two parts, 2002 and 1002002, that added together give a square (1004004 = 1002²).

The spelling of 20021002002 in words is "twenty billion, twenty-one million, two thousand, two".