20001103220 has 72 divisors (see below), whose sum is σ = 48893993064. Its totient is φ = 6852728064.

The previous prime is 20001103193. The next prime is 20001103247. The reversal of 20001103220 is 2230110002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20001103193) and next prime (20001103247).

It can be written as a sum of positive squares in 4 ways, for example, as 11102224 + 19990000996 = 3332^2 + 141386^2 .

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, 1574414 + ... + 1587066.

It is an arithmetic number, because the mean of its divisors is an integer number (679083237).

Almost surely, 2^20001103220 is an apocalyptic number.

20001103220 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 20001103220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24446996532).

20001103220 is an abundant number, since it is smaller than the sum of its proper divisors (28892889844).

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

20001103220 is a wasteful number, since it uses less digits than its factorization.

20001103220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14289 (or 14280 counting only the distinct ones).

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

Adding to 20001103220 its reverse (2230110002), we get a palindrome (22231213222).

The spelling of 20001103220 in words is "twenty billion, one million, one hundred three thousand, two hundred twenty".