20208220 has 12 divisors (see below), whose sum is σ = 42437304. Its totient is φ = 8083280.

The previous prime is 20208217. The next prime is 20208241. The reversal of 20208220 is 2280202.

It is a junction number, because it is equal to n+sod(n) for n = 20208194 and 20208203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505186 + ... + 505225.

It is an arithmetic number, because the mean of its divisors is an integer number (3536442).

Almost surely, 2^20208220 is an apocalyptic number.

20208220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20208220 is an abundant number, since it is smaller than the sum of its proper divisors (22229084).

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

20208220 is a wasteful number, since it uses less digits than its factorization.

20208220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010420 (or 1010418 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20208220 is about 4495.3553808348. The cubic root of 20208220 is about 272.3805047994.

Adding to 20208220 its reverse (2280202), we get a palindrome (22488422).

The spelling of 20208220 in words is "twenty million, two hundred eight thousand, two hundred twenty".