20202220 has 24 divisors (see below), whose sum is σ = 42691824. Its totient is φ = 8030016.

The previous prime is 20202197. The next prime is 20202223. The reversal of 20202220 is 2220202.

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 = 20202197 and 20202206.

It is not an unprimeable number, because it can be changed into a prime (20202223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 6358.

It is an arithmetic number, because the mean of its divisors is an integer number (1778826).

Almost surely, 2^20202220 is an apocalyptic number.

20202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20202220 is an abundant number, since it is smaller than the sum of its proper divisors (22489604).

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

20202220 is a wasteful number, since it uses less digits than its factorization.

20202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369 (or 6367 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 20202220 is about 4494.6879758221. The cubic root of 20202220 is about 272.3535447340.

Adding to 20202220 its reverse (2220202), we get a palindrome (22422422).

The spelling of 20202220 in words is "twenty million, two hundred two thousand, two hundred twenty".