20122220 has 24 divisors (see below), whose sum is σ = 44743104. Its totient is φ = 7575296.

The previous prime is 20122213. The next prime is 20122241. The reversal of 20122220 is 2222102.

It is an unprimeable number.

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, 29252 + ... + 29931.

It is an arithmetic number, because the mean of its divisors is an integer number (1864296).

Almost surely, 2^20122220 is an apocalyptic number.

20122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20122220 is an abundant number, since it is smaller than the sum of its proper divisors (24620884).

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

20122220 is a wasteful number, since it uses less digits than its factorization.

20122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59209 (or 59207 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20122220 is about 4485.7797538444. The cubic root of 20122220 is about 271.9935660243.

Adding to 20122220 its reverse (2222102), we get a palindrome (22344322).

The spelling of 20122220 in words is "twenty million, one hundred twenty-two thousand, two hundred twenty".