20021320002 has 64 divisors (see below), whose sum is σ = 44467087104. Its totient is φ = 5977466880.

The previous prime is 20021319943. The next prime is 20021320037. The reversal of 20021320002 is 20002312002.

It is a self number, because there is not a number n which added to its sum of digits gives 20021320002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 440502 + ... + 483822.

It is an arithmetic number, because the mean of its divisors is an integer number (694798236).

Almost surely, 2^20021320002 is an apocalyptic number.

20021320002 is an abundant number, since it is smaller than the sum of its proper divisors (24445767102).

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

20021320002 is a wasteful number, since it uses less digits than its factorization.

20021320002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43563.

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 20021320002 its reverse (20002312002), we get a palindrome (40023632004).

The spelling of 20021320002 in words is "twenty billion, twenty-one million, three hundred twenty thousand, two".