20204420 has 24 divisors (see below), whose sum is σ = 43127448. Its totient is φ = 7948800.

The previous prime is 20204417. The next prime is 20204477. The reversal of 20204420 is 2440202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1420864 + 18783556 = 1192^2 + 4334^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20204395 and 20204404.

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, 7061 + ... + 9500.

It is an arithmetic number, because the mean of its divisors is an integer number (1796977).

Almost surely, 2^20204420 is an apocalyptic number.

20204420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20204420 is an abundant number, since it is smaller than the sum of its proper divisors (22923028).

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

20204420 is a wasteful number, since it uses less digits than its factorization.

20204420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16631 (or 16629 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20204420 is about 4494.9327024996. The cubic root of 20204420 is about 272.3634307111.

Adding to 20204420 its reverse (2440202), we get a palindrome (22644622).

The spelling of 20204420 in words is "twenty million, two hundred four thousand, four hundred twenty".