20020220 has 96 divisors (see below), whose sum is σ = 49968576. Its totient is φ = 6656000.

The previous prime is 20020207. The next prime is 20020223. The reversal of 20020220 is 2202002.

20020220 = 132² + 133² + ... + 396².

It is a junction number, because it is equal to n+sod(n) for n = 20020198 and 20020207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198170 + ... + 198270.

It is an arithmetic number, because the mean of its divisors is an integer number (520506).

Almost surely, 2^20020220 is an apocalyptic number.

20020220 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 20020220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24984288).

20020220 is an abundant number, since it is smaller than the sum of its proper divisors (29948356).

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

20020220 is a wasteful number, since it uses less digits than its factorization.

20020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 20020220 is about 4474.3960486305. The cubic root of 20020220 is about 271.5332067231.

Adding to 20020220 its reverse (2202002), we get a palindrome (22222222).

The spelling of 20020220 in words is "twenty million, twenty thousand, two hundred twenty".