20020017220 has 36 divisors (see below), whose sum is σ = 48906044460. Its totient is φ = 6864005568.

The previous prime is 20020017179. The next prime is 20020017221. The reversal of 20020017220 is 2271002002.

It can be written as a sum of positive squares in 2 ways, for example, as 12698134596 + 7321882624 = 112686^2 + 85568^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20020017194 and 20020017203.

It is not an unprimeable number, because it can be changed into a prime (20020017221) 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 11 ways as a sum of consecutive naturals, for example, 10213315 + ... + 10215274.

It is an arithmetic number, because the mean of its divisors is an integer number (1358501235).

Almost surely, 2^20020017220 is an apocalyptic number.

20020017220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20020017220 is an abundant number, since it is smaller than the sum of its proper divisors (28886027240).

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

20020017220 is a wasteful number, since it uses less digits than its factorization.

20020017220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20428612 (or 20428603 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

Adding to 20020017220 its reverse (2271002002), we get a palindrome (22291019222).

The spelling of 20020017220 in words is "twenty billion, twenty million, seventeen thousand, two hundred twenty".