20142220 has 24 divisors (see below), whose sum is σ = 48341664. Its totient is φ = 6905856.

The previous prime is 20142209. The next prime is 20142247. The reversal of 20142220 is 2224102.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20142220.

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, 71797 + ... + 72076.

It is an arithmetic number, because the mean of its divisors is an integer number (2014236).

Almost surely, 2^20142220 is an apocalyptic number.

20142220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20142220 is an abundant number, since it is smaller than the sum of its proper divisors (28199444).

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

20142220 is a wasteful number, since it uses less digits than its factorization.

20142220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143889 (or 143887 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20142220 is about 4488.0084670152. The cubic root of 20142220 is about 272.0836500216.

Adding to 20142220 its reverse (2224102), we get a palindrome (22366322).

The spelling of 20142220 in words is "twenty million, one hundred forty-two thousand, two hundred twenty".