20022221220 has 48 divisors (see below), whose sum is σ = 56208660480. Its totient is φ = 5325312256.

The previous prime is 20022221201. The next prime is 20022221221. The reversal of 20022221220 is 2212222002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20022221220.

It is not an unprimeable number, because it can be changed into a prime (20022221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412665 + ... + 458624.

It is an arithmetic number, because the mean of its divisors is an integer number (1171013760).

Almost surely, 2^20022221220 is an apocalyptic number.

20022221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022221220 is an abundant number, since it is smaller than the sum of its proper divisors (36186439260).

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

20022221220 is a wasteful number, since it uses less digits than its factorization.

20022221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871684 (or 871682 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 20022221220 its reverse (2212222002), we get a palindrome (22234443222).

It can be divided in two parts, 2002 and 2221220, that added together give a palindrome (2223222).

The spelling of 20022221220 in words is "twenty billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty".