20001222160 has 80 divisors (see below), whose sum is σ = 49291974576. Its totient is φ = 7521665024.

The previous prime is 20001222149. The next prime is 20001222161. The reversal of 20001222160 is 6122210002.

It can be written as a sum of positive squares in 8 ways, for example, as 6898299136 + 13102923024 = 83056^2 + 114468^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20001222161) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1321194 + ... + 1336246.

Almost surely, 2^20001222160 is an apocalyptic number.

20001222160 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 20001222160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24645987288).

20001222160 is an abundant number, since it is smaller than the sum of its proper divisors (29290752416).

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

20001222160 is a wasteful number, since it uses less digits than its factorization.

20001222160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16060 (or 16054 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20001222160 its reverse (6122210002), we get a palindrome (26123432162).

The spelling of 20001222160 in words is "twenty billion, one million, two hundred twenty-two thousand, one hundred sixty".