20442220 has 24 divisors (see below), whose sum is σ = 43017408. Its totient is φ = 8160000.

The previous prime is 20442203. The next prime is 20442269. The reversal of 20442220 is 2224402.

It is a junction number, because it is equal to n+sod(n) for n = 20442194 and 20442203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14340 + ... + 15700.

It is an arithmetic number, because the mean of its divisors is an integer number (1792392).

Almost surely, 2^20442220 is an apocalyptic number.

20442220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20442220 is an abundant number, since it is smaller than the sum of its proper divisors (22575188).

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

20442220 is a wasteful number, since it uses less digits than its factorization.

20442220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121 (or 2119 counting only the distinct ones).

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

The square root of 20442220 is about 4521.3073330620. The cubic root of 20442220 is about 273.4278112159.

Adding to 20442220 its reverse (2224402), we get a palindrome (22666622).

It can be divided in two parts, 204 and 42220, that added together give a palindrome (42424).

The spelling of 20442220 in words is "twenty million, four hundred forty-two thousand, two hundred twenty".