20021103200 has 144 divisors (see below), whose sum is σ = 55962355680. Its totient is φ = 6851665920.

The previous prime is 20021103173. The next prime is 20021103239. The reversal of 20021103200 is 230112002.

It is a happy number.

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, 3317786 + ... + 3323814.

It is an arithmetic number, because the mean of its divisors is an integer number (388627470).

Almost surely, 2^20021103200 is an apocalyptic number.

20021103200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021103200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27981177840).

20021103200 is an abundant number, since it is smaller than the sum of its proper divisors (35941252480).

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

20021103200 is a wasteful number, since it uses less digits than its factorization.

20021103200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6649 (or 6636 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20021103200 its reverse (230112002), we get a palindrome (20251215202).

The spelling of 20021103200 in words is "twenty billion, twenty-one million, one hundred three thousand, two hundred".