20550340 has 24 divisors (see below), whose sum is σ = 43247232. Its totient is φ = 8202720.

The previous prime is 20550329. The next prime is 20550347. The reversal of 20550340 is 4305502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20550347) by changing a digit.

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, 13077 + ... + 14563.

It is an arithmetic number, because the mean of its divisors is an integer number (1801968).

Almost surely, 2^20550340 is an apocalyptic number.

20550340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20550340 is an abundant number, since it is smaller than the sum of its proper divisors (22696892).

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

20550340 is a wasteful number, since it uses less digits than its factorization.

20550340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187 (or 2185 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20550340 is about 4533.2482835159. The cubic root of 20550340 is about 273.9090219558.

Adding to 20550340 its reverse (4305502), we get a palindrome (24855842).

The spelling of 20550340 in words is "twenty million, five hundred fifty thousand, three hundred forty".