20005340 has 24 divisors (see below), whose sum is σ = 42239232. Its totient is φ = 7958720.

The previous prime is 20005319. The next prime is 20005343. The reversal of 20005340 is 4350002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005343) 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, 1202 + ... + 6438.

It is an arithmetic number, because the mean of its divisors is an integer number (1759968).

Almost surely, 2^20005340 is an apocalyptic number.

20005340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20005340 is an abundant number, since it is smaller than the sum of its proper divisors (22233892).

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

20005340 is a wasteful number, since it uses less digits than its factorization.

20005340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5437 (or 5435 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20005340 is about 4472.7329453031. The cubic root of 20005340 is about 271.4659178265.

Adding to 20005340 its reverse (4350002), we get a palindrome (24355342).

The spelling of 20005340 in words is "twenty million, five thousand, three hundred forty".