20001102220 has 96 divisors (see below), whose sum is σ = 49461995520. Its totient is φ = 6716962560.

The previous prime is 20001102167. The next prime is 20001102269. The reversal of 20001102220 is 2220110002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20001102197 and 20001102206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78589 + ... + 214891.

It is an arithmetic number, because the mean of its divisors is an integer number (515229120).

Almost surely, 2^20001102220 is an apocalyptic number.

20001102220 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 20001102220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24730997760).

20001102220 is an abundant number, since it is smaller than the sum of its proper divisors (29460893300).

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

20001102220 is a wasteful number, since it uses less digits than its factorization.

20001102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136375 (or 136373 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20001102220 its reverse (2220110002), we get a palindrome (22221212222).

It can be divided in two parts, 20001 and 102220, that added together give a palindrome (122221).

The spelling of 20001102220 in words is "twenty billion, one million, one hundred two thousand, two hundred twenty".