20424220 has 24 divisors (see below), whose sum is σ = 43319808. Its totient is φ = 8088000.

The previous prime is 20424199. The next prime is 20424247. The reversal of 20424220 is 2242402.

It is a junction number, because it is equal to n+sod(n) for n = 20424194 and 20424203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3036 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (1804992).

Almost surely, 2^20424220 is an apocalyptic number.

20424220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20424220 is an abundant number, since it is smaller than the sum of its proper divisors (22895588).

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

20424220 is a wasteful number, since it uses less digits than its factorization.

20424220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10221 (or 10219 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20424220 is about 4519.3163199758. The cubic root of 20424220 is about 273.3475337986.

Adding to 20424220 its reverse (2242402), we get a palindrome (22666622).

The spelling of 20424220 in words is "twenty million, four hundred twenty-four thousand, two hundred twenty".